Monster Media 1996 #14/Monster Media No. 14 (April 1996) (Monster Media, Inc.).ISO/prog_gen/inter49c.zip/INTERRUP.I

Text File | 1996-02-11 | 342KB | 9,378 lines

Interrupt List, part 9 of 14
Copyright (c) 1989,1990,1991,1992,1993,1994,1995,1996 Ralf Brown
--------m-2F4300-----------------------------
INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - INSTALLATION CHECK
    AX = 4300h
Return: AL = 80h XMS driver installed
    AL <> 80h no driver
Notes:    XMS gives access to extended memory and noncontiguous/nonEMS memory
      above 640K
    this installation check DOES NOT follow the format used by other
      software
SeeAlso: AX=4310h
Index:    installation check;XMS version 2+
--------m-2F4308-----------------------------
INT 2F U - HIMEM.SYS v2.77+ - GET A20 HANDLER NUMBER
    AX = 4308h
Return: AL = 43h if supported
        BL = A20 handler number (value of /MACHINE:nn switch)
        BH = AT A20 switch time (00h medium, 01h fast, 02h slow)
Note:    if the A20 handler number returned in BL is 00h, an external handler
      is being used (see AX=4330h)
SeeAlso: AX=4309h,AX=4330h
--------m-2F4309-----------------------------
INT 2F U - HIMEM.SYS v3.09+ - GET XMS HANDLE TABLE
    AX = 4309h
Return: AL = 43h if function supported
        ES:BX -> XMS handle table (see #1936)
Note:    HIMEM.SYS v3.09 is part of MS-DOS 6.0.
SeeAlso: AX=4308h

Format of XMS handle table:
Offset    Size    Description    (Table 1936)
 00h    BYTE    ??? (01h in HIMEM.SYS v3.09)
 01h    BYTE    size of one handle descriptor
 02h    WORD    number of handles (default = 20h)
 04h    DWORD    pointer to XMS handle array (see #1937)
SeeAlso: #1966

Format of XMS handle descriptor [array]:
Offset    Size    Description    (Table 1937)
 00h    BYTE    flag
        01h=free, 02h=used, 04h=in pool but not associated with any EMB
 01h    BYTE    lock count (00h=unlocked)
 02h    DWORD    address of XMS block in KB (shift left by 10 for abs. address)
 06h    DWORD    size of XMS block in KB
--------m-2F4310-----------------------------
INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - GET DRIVER ADDRESS
    AX = 4310h
Return: ES:BX -> driver entry point (see #1938,#1939,#1942,#1949,#1958,#1963)
Notes:    HIMEM.SYS v2.77 chains to previous handler if AH is not 00h or 10h
    HIMEM.SYS requires at least 256 bytes free stack space when calling
      the driver entry point
SeeAlso: AX=4300h,AX=4310h"Cloaking",AX=4310h"Netroom",AX=4310h"XMZ"

Format of XMS driver entry point:
Offset    Size    Description    (Table 1938)
 00h  5 BYTEs    jump to actual handler
        either short jump (EBh XXh) followed by three NOPs or
          far jump (EAh XXXX:XXXX) to a program which has hooked itself
          into the XMS driver chain
Note:    to hook into the XMS driver chain, a program should follow the chain of
      far jumps until it reaches the short jump of the driver at the end
      of the chain; this short jump is to be replaced with a far jump to
      the new handler's entry point, which should contain a short jump
      followed by three NOPs.  The new handler must return to the address
      pointed at by the short jump which was overwritten.  Using this
      method, the new handler becomes the first to see every XMS request.

(Table 1939)
Call the XMS driver "Get XMS version number" function with:
    AH = 00h
Return: AX = XMS version (in BCD, AH=major, AL=minor)
    BX = internal revision number (in BCD for HIMEM.SYS)
    DX = High Memory Area (HMA) state
        0001h HMA (1M to 1M + 64K) exists
        0000h HMA does not exist
SeeAlso: #1940,#1941,#1946,#1947,#1953

(Table 1940)
Call the XMS driver "Request High Memory Area" function with:
    AH = 01h
    DX = memory in bytes (for TSR or device drivers)
        FFFFh if application program
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,90h,91h,92h) (see #1964)
Note:    HIMEM.SYS will fail function 01h with error code 91h if AL=40h and
      DX=KB free extended memory returned by last call of function 08h
SeeAlso: #1941,#1973

(Table 1941)
Call the XMS driver "Release High Memory Area" function with:
    AH = 02h
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,90h,93h) (see #1964)
SeeAlso: #1940

(Table 1942)
Call the XMS driver "Global enable A20, for using the HMA" function with:
    AH = 03h
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,82h) (see #1964)
SeeAlso: #1943,#1944

(Table 1943)
Call the XMS driver "Global disable A20" function with:
    AH = 04h
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,82h,94h) (see #1964)
SeeAlso: #1942,#1945

(Table 1944)
Call the XMS driver "Local enable A20" function with:
    AH = 05h
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,82h) (see #1964)
Note:    this function is used for direct access to extended memory
SeeAlso: #1942,#1945

(Table 1945)
Call the XMS driver "Local disable A20" function with:
    AH = 06h
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,82h,94h) (see #1964)
SeeAlso: #1943,#1944

(Table 1946)
Call the XMS driver "Query A20 state" function with:
    AH = 07h
Return: AX = status
        0001h enabled
        0000h disabled
        BL = error code (00h,80h,81h) (see #1964)
SeeAlso: #1939,#1947

(Table 1947)
Call the XMS driver "Query free extended memory" function with:
    AH = 08h
    BL = 00h (some implementations leave BL unchanged on success)
Return: AX = size of largest extended memory block in KB
    DX = total extended memory in KB
    BL = error code (00h,80h,81h,A0h) (see #1964)
Note:    this function does not include the HMA in the returned memory sizes
SeeAlso: #1939,#1946,#1948,#1960

(Table 1948)
Call the XMS driver "Allocate extended memory block" function with:
    AH = 09h
    DX = Kbytes needed
Return: AX = status
        0001h success
        DX = handle for memory block
        0000h failure
        BL = error code (80h,81h,A0h) (see #1964)
SeeAlso: #1947,#1950,#1953,#1954,#1955,#1961

(Table 1949)
Call the XMS driver "Free extended memory block" function with:
    AH = 0Ah
    DX = handle of block to free
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,A2h,ABh) (see #1964)
SeeAlso: #1948,#1961

(Table 1950)
Call the XMS driver "Move extended memory block" function with:
    AH = 0Bh
    DS:SI -> EMM structure (see #1965)
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h-82h,A3h-A9h) (see #1964)
Note:    if either handle in the EMM structure is 0000h, the corresponding
      offset is considered to be an absolute segment:offset address in
      directly addressable memory
SeeAlso: #1948,#1951

(Table 1951)
Call the XMS driver "Lock extended memory block" function with:
    AH = 0Ch
    DX = handle of block to lock
Return: AX = status
        0001h success
        DX:BX = 32-bit physical address of locked block
        0000h failure
        BL = error code (80h,81h,A2h,ACh,ADh) (see #1964)
Note:    MS Windows 3.x rejects this function for handles allocated after
      Windows started
SeeAlso: #1948,#1950,#1952

(Table 1952)
Call the XMS driver "Unlock extended memory block" function with:
    AH = 0Dh
    DX = handle of block to unlock
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,A2h,AAh) (see #1964)
SeeAlso: #1951

(Table 1953)
Call the XMS driver "Get handle information" function with:
    AH = 0Eh
    DX = handle for which to get info
Return: AX = status
        0001h success
        BH = block's lock count
        BL = number of free handles left
        DX = block size in KB
        0000h failure
        BL = error code (80h,81h,A2h) (see #1964)
BUG:    MS Windows 3.10 acts as though unallocated handles are in use
Note:    MS Windows 3.00 has problems with this call
SeeAlso: #1939,#1948,#1962

(Table 1954)
Call the XMS driver "Reallocate extended memory block" function with:
    AH = 0Fh
    DX = handle of block
    BX = new size of block in KB
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,81h,A0h-A2h,ABh) (see #1964)
SeeAlso: #1948,#1957

(Table 1955)
Call the XMS driver "Request upper memory block" function with:
    AH = 10h
    DX = size of block in paragraphs
Return: AX = status
        0001h success
        BX = segment address of UMB
        DX = actual size of block
        0000h failure
        BL = error code (80h,B0h,B1h) (see #1964)
        DX = largest available block
Notes:    Upper Memory consists of non-EMS memory between 640K and 1024K
    the XMS driver need not implement functions 10h through 12h to be
      considered compliant with the standard
    under DOS 5+, if CONFIG.SYS contains the line DOS=UMB, then no upper
      memory blocks will be available for allocation because all blocks
      have been grabbed by MS-DOS while booting
SeeAlso: #1948,#1956,#1974,INT 21/AH=58h"UMB"

(Table 1956)
Call the XMS driver "Release upper memory block" function with:
    AH = 11h
    DX = segment address of UMB to release
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,B2h) (see #1964)
Note:    the XMS driver need not implement functions 10h through 12h to be
      considered compliant with the standard
SeeAlso: #1949,#1955,#1957

(Table 1957)
Call the XMS v3.0+ driver "Reallocate upper memory block" function with:
    AH = 12h
    DX = segment address of UMB to resize
    BX = new size of block in paragraphs
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,B0h,B2h) (see #1964)
        DX = maximum available size (RM386)
Note:    the XMS driver need not implement functions 10h through 12h to be
      considered compliant with the standard
SeeAlso: #1954,#1955,#1956,#1972

(Table 1958)
Call the QEMM v5.11 "???" function with:
    AH = 34h  (QEMM 5.11 only, undocumented)
    ???
Return: ???
SeeAlso: #1959

(Table 1959)
Call the QEMM v5.11 "???" function with:
    AH = 44h  (QEMM 5.11 only, undocumented)
    ???
Return: ???
SeeAlso: #1958,#1972

(Table 1960)
Call the XMS v3.0 driver "Query free extended memory" function with:
    AH = 88h
Return: EAX = largest block of extended memory, in KB
    BL = status (00h,80h,81h,A0h) (see #1964)
    ECX = physical address of highest byte of memory
        (valid even on error codes 81h and A0h)
    EDX = total Kbytes of extended memory (0 if status A0h)
BUG:    HIMEM v3.03-3.07 crash on an 80286 machine if any of the 8Xh functions
      are called
SeeAlso: #1947,#1961

(Table 1961)
Call the XMS v3.0 driver "Allocate any extended memory" function with:
    AH = 89h
    EDX = Kbytes needed
Return: AX = status
        0001h success
        DX = handle for allocated block (free with AH=0Ah) (see #1949)
        0000h failure
        BL = status (80h,81h,A0h,A1h,A2h) (see #1964)
SeeAlso: #1948,#1960

(Table 1962)
Call the XMS v3.0 driver "Get extended EMB handle information" function with:
    AH = 8Eh
    DX = handle
Return: AX = status
        0001h success
        BH = block's lock count
        CX = number of free handles left
        EDX = block size in KB
        0000h failure
        BL = status (80h,81h,A2h) (see #1964)
BUG:    MS-DOS 6.0 HIMEM.SYS leaves CX unchanged
SeeAlso: #1953,#1961,#1963

(Table 1963)
Call the XMS v3.0 driver "Reallocate any extended memory block" function with:
    AH = 8Fh
    DX = unlocked memory block handle
    EBX = new size in KB
Return: AX = status
        0001h success
        0000h failure
        BL = status (80h,81h,A0h-A2h,ABh) (see #1964)
BUG:    HIMEM v3.03-3.07 crash on an 80286 machine if any of the 8Xh functions
      are called
SeeAlso: #1954,#1962

(Table 1964)
Values for XMS error code returned in BL:
 00h    successful
 80h    function not implemented
 81h    Vdisk was detected
 82h    an A20 error occurred
 8Eh    a general driver error
 8Fh    unrecoverable driver error
 90h    HMA does not exist or is not managed by XMS provider
 91h    HMA is already in use
 92h    DX is less than the /HMAMIN= parameter
 93h    HMA is not allocated
 94h    A20 line still enabled
 A0h    all extended memory is allocated
 A1h    all available extended memory handles are allocated
 A2h    invalid handle
 A3h    source handle is invalid
 A4h    source offset is invalid
 A5h    destination handle is invalid
 A6h    destination offset is invalid
 A7h    length is invalid
 A8h    move has an invalid overlap
 A9h    parity error occurred
 AAh    block is not locked
 ABh    block is locked
 ACh    block lock count overflowed
 ADh    lock failed
 B0h    only a smaller UMB is available
 B1h    no UMB's are available
 B2h    UMB segment number is invalid

Format of EMM structure:
Offset    Size    Description    (Table 1965)
 00h    DWORD    number of bytes to move (must be even)
 04h    WORD    source handle
 06h    DWORD    offset into source block
 0Ah    WORD    destination handle
 0Ch    DWORD    offset into destination block
Notes:    if source and destination overlap, only forward moves (source base
      less than destination base) are guaranteed to work properly
    if either handle is zero, the corresponding offset is interpreted
      as a real-mode address referring to memory directly addressable
      by the processor

Format of XMS handle info [array]:
Offset    Size    Description    (Table 1966)
 00h    BYTE    handle
 01h    BYTE    lock count
 02h    DWORD    handle size
 06h    DWORD    handle physical address (only valid if lock count nonzero)
SeeAlso: #1936
--------m-2F4310-----------------------------
INT 2F - Cloaking - REAL-MODE API
    AX = 4310h
Return: ES:BX -> driver entry point (see #1938,#1967,#1968,#1969,#1970)
SeeAlso: AX=4310h"XMS"

(Table 1967)
Call the Cloaking v1.01 "Client Registration" function with:
    AH = 7Eh
    BX = subfunction
        0000h get client registration count
        0001h get client registration structures
        ES:DI -> buffer for registration structures
Return: AX = status
        0000h failed
        0001h successful
        ---subfunction 00h---
        BX = size of client structure in bytes
        CX = number of clients installed
        ---subfunction 01h---
        ES:DI buffer filled
SeeAlso: #1968,#1970,INT 2C/AX=0033h

(Table 1968)
Call the Cloaking v1.01 "Verify Cloaking Host" function with:
    AH = 7Fh
Return: AX = status
        0000h failed
        0001h (successful) if installed
        BX = version (0101h for v1.01)
        CX = flags
            bit 0: host is VCPI-based
        DS:DX -> ASCIZ Cloaking host signature
            "CLOAKING.EXE"0, followed by a far-call entry point to
              uninstall host (see #1969) in Helix's CLOAKING.EXE
SeeAlso: #1967,#1970
Index:    installation check;Cloaking host|installation check;CLOAKING.EXE

(Table 1969)
Call the CLOAKING.EXE "Uninstall Host" function with:
Return:    AX = 4F4Bh ('OK') if successfully uninstalled protected-mode code

(Table 1970)
Call the Cloaking "Start Protected-Mode Client" function with:
    AH = 82h
    DX = XMS handle of locked block containing protected-mode code
    CL = code size (00h 16-bit, else 32-bit)
    ESI, EDI = parameters to pass to protected-mode code
Return: AX = status
        nonzero success
        0000h failed
        BL = error code (A2h,B0h) (see #1964)
Notes:    this function calls a user initialization function at offset 0 in
      the XMS memory block (see #1971)
    supported by Helix's RM386 v6.00 and Helix's CLOAKING.EXE
SeeAlso: #1967,#1968

(Table 1971)
Values user initialization function is called with:
    EBX = physical address of block's start
    ESI = user data from function 82h call
    EDI = user data from function 82h call
    CS = code selector for XMS block at EBX (16-bit or 32-bit)
    DS = data selector for XMS block, starting at EBX
    ES = selector for V86 memory access to full real-mode 1088K
    GS = selector for full 4G flat address space
    SS:ESP -> stack provided by host
Return: via 32-bit FAR return
Note:    the initialization function may call any protected-mode Cloaking
      service; it should store the values of DS, ES, and GS for future
      reference
--------m-2F4310-----------------------------
INT 2F - Helix Netroom RM386 v6.00 - XMS EXTENSIONS
    AX = 4310h
Return: ES:BX -> driver entry point (see #1972,#1973,#1974,#1975)
Notes:    HIMEM.SYS v2.77 chains to previous handler if AH is not 00h or 10h
    HIMEM.SYS requires at least 256 bytes free stack space when calling
      the driver entry point
SeeAlso: AX=4300h,AX=4310h"XMS",AX=4310h"Cloaking"

(Table 1972)
Call the Netroom RM386 v6.00 "Reallocate upper memory block" function with:
    AH = 80h
    DX = segment address of UMB to resize
    BX = new size of block in paragraphs
Return: AX = status
        0001h success
        0000h failure
        BL = error code (80h,B0h,B2h) (see #1964)
        DX = maximum available size
Note:    this function is identical to function 12h
SeeAlso: #1957,#1973

(Table 1973)
Call the Netroom RM386 v6.00 "re-enable HMA allocation" function with:
    AH = 81h
Return: AX = 0001h (success)
SeeAlso: #1940,#1972,#1974

(Table 1974)
Call the Netroom RM386 v6.00 "Create new UMB entry" function with:
    AH = 83h
    BX = segment of high-memory block
    DX = first page of start of block
    CX = number of consecutive pages in block
    DI = start of UMB in block
Return: AX = 0001h (success)
    DI = segment of first high-DOS block
Note:    the new UMB is not linked into the high-memory chain
SeeAlso: #1955,#1973,#1975

(Table 1975)
Call the Netroom RM386 v6.00 "Get all XMS handles info" function with:
    AH = 84h
    CX = size of buffer for handle info
    ES:DI -> buffer for handle info (see #1966)
Return: AX = 0001h (success)
    DX = current number of allocated XMS handles
SeeAlso: #1974,#1960
--------m-2F4310-----------------------------
INT 2F - NEC PC-9800 - XMZ - PRIVATE API
    AX = 4310h
Return: ES:BX -> driver entry point (see #1976,2713)
Program: XMZ is an XMS 2.x-compatible driver for the NEC PC-98 series written
      by ZOBplus Hayami and available at
      ftp:/ftp.tohoku.ac.jp/pub/msdos/Memory/xmz/
SeeAlso: AX=4300h,AX=4310h"XMS"

(Table 1976)
Call XMZ v1.02 "Get HMA Information" function with:
    AH = FFh  (XMZ only)
    AL = 01h
Return: AX = 1 on success
    DX = minimum HMA allocation size (/HMAMIN=)
    BX = actual size of HMA allocation, if in use (i.e. the value in DX
          when XMS function 1 was called)
SeeAlso: #1977

(Table 1977)
Call XMZ v1.02 "Get EMB Handle Information" function with:
    AH = FFh  (XMZ only)
    AL = 02h
Return: AX = 1 on success
    DX = number of EMB handles configured (/NUMHANDLES=)
    BX = offset in XMZ's segment of the handle table (use segment of
          entry point) (see #1978)
SeeAlso: #1976

Format of XMZ v1.02 EMB Handle structure:
Offset    Size    Description    (Table 1978)
 00h    BYTE    flag byte
        04h unused handle slot
        02h in-use handle slot
        01h handle slot that represents a free block
 01h    BYTE    lock count
 02h    WORD    block start address (1K increments)
 04h    WORD    block length (1K increments)
SeeAlso: #1977
--------m-2F4320-----------------------------
INT 2F U - HIMEM.SYS - Mach 20 SUPPORT
    AX = 4320h
    ???
Return: ???
--------m-2F4330-----------------------------
INT 2F CU - HIMEM.SYS v2.77+ - GET EXTERNAL A20 HANDLER ADDRESS
    AX = 4330h
Return: AL = 80h if external A20 handler provided
        ES:BX -> external A20 handler (see #1979)
        CL = A20 detection support
        00h handler is unable to report A20 state
        01h handler supports function 0002h to report A20 state
Note:    HIMEM.SYS calls this function to allow an external program to provide
      an A20 handler (i.e. to support a machine not supported by HIMEM
      itself)
SeeAlso: AX=4308h,AX=4310h

(Table 1979)
Call parameters for external A20 handler are:
    AX = function
        0000h disable A20
        0001h enable A20
        0002h get A20 state
Return: AX = status (functions 0000h and 0001h)
        0000h failure
        0001h successful
    AX = A20 state (function 0002h)
        0000h disabled
        0001h enabled
Note:    HIMEM.SYS only calls function 0002h if the returned CL indicated that
      the handler supports the call
--------E-2F43E0BX0000-----------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - INSTALLATION CHECK
    AX = 43E0h
    BX = 0000h
    CX = 4450h ('DP')
    DX = 4D53h ('MS')
Return: AX = 0000h if installed
        CF clear
        ES:DI -> server structure (see #1980)
        ES:BX -> registration structure (pre-NWDOS 7 beta spec) (see #1982)
Note:    the DPMS 1.0 server included with the original release of Novell DOS
      7.0 supports both the beta and 1.0 specification, setting ES:BX even
      if CX and DX are not as specified on entry (since the beta
      specification did not use those registers).  However, the DPMS 1.1
      server included with the March 1994 update does not support the beta
      specification
SeeAlso: AX=43E1h,AX=43E2h,AX=43E3h,INT 2F/AX=1687h
Index:    signature strings;DPMS

Format of DPMS 1.0 server structure:
Offset    Size    Description    (Table 1980)
 00h  4 BYTEs    signature string "DPMS"
 04h  2 BYTEs    DPMS version (major,minor)
 06h  8 BYTEs    blank-padded server OEM name
 0Eh  2 BYTEs    OEM server version (major,minor)
 10h    WORD    DPMS flags (see #1981)
 12h    BYTE    CPU type
        (02h = 286, 03h = 386 or higher, higher values allowed)

Bitfields for DPMS flags:
Bit(s)    Description    (Table 1981)
 0    fast processor reset available (286 only)
 1    DPMS server is enabled
 2    memory is remapped
 3-15    reserved (undefined)

Format of beta DPMS registration structure:
Offset    Size    Description    (Table 1982)
 00h    DWORD    real-mode API entry point (see #1984)
 04h    DWORD    16-bit protected-mode API entry point (see #1984)
 08h  8 BYTEs    reserved (0)
 10h  8 BYTEs    blank-padded server OEM name
 18h    WORD    flags
        bit 0: fast processor reset available (286 only)
        bits 1-15 reserved (undefined)
 1Ah  2 BYTEs    DPMS version (major,minor)
 1Ch    BYTE    CPU type (02h = 286, 03h = 386 or higher)
--------m-2F43E1-----------------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - REGISTER CLIENT
    AX = 43E1h
    CX = required protected-mode stack size in bytes
    ES:DI -> DPMS client interface structure (see #1983)
Return: AX = 0000h if supported
       CF clear
       ES:DI buffer filled with API entry point code from offset 0Ah
Note:    the client is allowed to copy the returned API code to any location in
      memory, and need not keep the three code fields together
SeeAlso: AX=43E0h,AX=43E2h,AX=43E3h

Format of DPMS client interface structure:
Offset    Size    Description    (Table 1983)
 00h    WORD    0000h (structure version / flags)
 02h  8 BYTEs    blank-padded client name
 0Ah  7 BYTEs    real/virtual-86 mode API code (see #1984)
 11h    BYTE    space for return instruction
        set to C3h for near return, CBh for far return
 12h  7 BYTEs    16-bit protected-mode API code (see #1984)
 19h    BYTE    space for return instruction
        set to C3h for near return, CBh for far return
 1Ah  9 BYTEs    32-bit protected-mode API code (see #1984)
 23h    BYTE    space for return instruction
        set to C3h for near return, CBh for far return
Note:    the DPMS server fills the return opcode bytes with zeros and DPMS
      requests will thus crash the system unless the application
      explicitly sets them (some early versions set them to C3h by
      default, but one should not rely on that)

(Table 1984)
Call DPMS entry point with:
    AX = 0000h unregister client from server
 ---control transfer functions---
    AX = 0100h call protected-mode procedure
        CX = number of words of stack to copy
        ES:(E)DI -> callup/down register structure (see #1986)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0101h call real-mode procedure (RETF return)
        CX = number of words of stack to copy
        ES:(E)DI -> callup/down register structure (see #1986)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0102h call real-mode procedure (IRET return)
        CX = number of words of stack to copy
        ES:(E)DI -> callup/down register structure (see #1986)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0103h call real-mode interrupt handler
        BL = interrupt number
        CX = number of words of stack to copy
        ES:(E)DI -> callup/down register structure (see #1986)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0104h register default protected mode procedure
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0105h register default real-mode procedure (RETF return)
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
        Note:    the procedure will be called from 16-bit prot. mode
    AX = 0106h register default real-mode procedure (IRET return)
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
        Note:    the procedure will be called from 16-bit prot. mode
    AX = 0107h register default real-mode interrupt handler
        BL = interrupt number
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
        Note:    the handler will be called from 16-bit protected mode
    AX = 0108h register default real-mode procedure (RETF return)
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
        Note:    the procedure will be called from 32-bit prot. mode
    AX = 0109h register default real-mode procedure (IRET return)
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
        Note:    the procedure will be called from 32-bit prot. mode
    AX = 010Ah register default real-mode interrupt handler
        BL = interrupt number
        ES:(E)DI -> default register structure (see #1987)
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
        Note:    the handler will be called from 32-bit protected mode
 ---descriptor management---
    AX = 0200h allocate descriptors
        CX = number of descriptors to allocate
        Return: CF clear if successful
                AX = selector for first descriptor allocated
            CF set on error
                AX = error code (see #1985)
    AX = 0201h free a descriptor
        BX = selector for descriptor
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0202h create alias descriptor
        BX = selector for descriptor to be aliased
        Return: CF clear if successful
                AX = alias descriptor
            CF set on error
                AX = error code (see #1985)
    AX = 0203h build alias to real-mode segment
        BX = descriptor
        CX = real-mode segment
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0204h set descriptor base
        BX = descriptor
        CX:DX = base address
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0205h set descriptor limit
        BX = descriptor
        CX = limit
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0206h set descriptor type/attribute
        BX = descriptor
        CL = type
        CH = attribute
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0207h get descriptor base
        BX = descriptor
        Return: CF clear if successful
                CX:DX = base address
            CF set on error
                AX = error code (see #1985)
 ---linear memory functions---
    AX = 0300h get size of largest free block of memory
        Return: CF clear if successful
                BX:CX = size
            CF set on error
                AX = error code (see #1985)
    AX = 0301h allocate block of extended memory
        BX:CX = required size
        Return: CF clear if successful
                BX:CX = base address
                SI:DI = handle
            CF set on error
                AX = error code (see #1985)
    AX = 0302h free block of extended memory
        SI:DI = handle
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0303h map linear memory
        ES:(E)DI -> DDS (see #1988)
        Return: CF clear if successful
                BX:CX = base address
                SI:DI = handle
            CF set on error
                AX = error code (see #1985)
    AX = 0304h unmap linear memory
        SI:DI = handle
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0305h get page table entries
        ESI = linear address
        (E)CX = count
        ES:(E)DI -> buffer for page table entries
        Return: CF clear if successful
                ES:(E)DI buffer filled
            CF set on error
                AX = error code (see #1985)
    AX = 0306h set page table entries
        EBX = linear memory handle
        ESI = linear address
        (E)CX = count
        ES:(E)DI -> buffer containing page table entries
        Return: CF clear if successful
            CF set on error
                AX = error code (see #1985)
    AX = 0307h get largest mappable block size
        Return: CF clear if successful
                BX:CX = size
            CF set on error
                AX = error code (see #1985)
 ---miscellaneous---
    AX = 0400h relocate segment to extended memory
        ES:SI = base address
        CX = limit
        BL = type
        BH = attribute
        DX = selector or 0000h
        Return: CF clear if successful
                AX = selector
                BX:CX = new base address
                SI:DI = handle
            CF set on error
                AX = error code (see #1985)
Note:    the beta DPMS specification, which is still supported by the Novell
      DOS 7.0 DPMS host, only supported functions 0100h-0103h, 0200h-0207h,
      0300h-0304h, and 0400h

(Table 1985)
Values for DPMS error code:
 8000h    general error
 8001h    unsupported function
 8002h    unable to switch to protected mode
 8004h    no default stack defined
 8005h    unknown client
 8010h    resource unavailable
 8011h    descriptor unavailable
 8012h    linear memory unavailable
 8013h    physical memory unavailable
 8021h    invalid value
 8022h    invalid selector
 8023h    invalid handle
 8025h    invalid linear address

Format of DPMS callup/down register structure:
Offset    Size    Description    (Table 1986)
 00h    DWORD    EDI
 04h    DWORD    ESI
 08h    DWORD    EBP
 0Ch  4 BYTEs    reserved (0) (ESP, may be used by DPMS server)
 10h    DWORD    EBX
 14h    DWORD    EDX
 18h    DWORD    ECX
 20h    DWORD    EAX
 24h    DWORD    EIP
 28h    WORD    CS
 2Ah  2 BYTEs    reserved (0)
 2Ch    DWORD    EFLAGS
 30h    DWORD    ESP
 34h    WORD    SS
 36h  2 BYTEs    reserved (0)
 38h    WORD    ES
 3Ah  2 BYTEs    reserved (0)
 3Ch    WORD    DS
 3Eh  2 BYTEs    reserved (0)
 40h    WORD    FS
 42h  2 BYTEs    reserved (0)
 44h    WORD    GS
 46h  2 BYTEs    reserved (0)

Format of DPMS default register structure:
Offset    Size    Description    (Table 1987)
 00h    DWORD    EIP
 04h    WORD    CS
 06h  2 BYTEs    reserved (0)
 08h    WORD    number of words to copy from stack to stack
 0Ah    BYTE    (call) 00h
        (ret) nonzero if call could not be made
 0Bh    BYTE    reserved (may be used by some servers)
 0Ch    DWORD    ESP
 10h    WORD    SS
 12h  2 BYTEs    reserved (0)
 14h    WORD    ES
 16h  2 BYTEs    reserved (0)
 18h    WORD    DS
 1Ah  2 BYTEs    reserved (0)
 1Ch    WORD    FS
 1Eh  2 BYTEs    reserved (0)
 20h    WORD    GS
 22h  2 BYTEs    reserved (0)
 24h  9 BYTEs    API entry code (filled in by server)

Format of DPMS lock DDS:
Offset    Size    Description    (Table 1988)
 00h    DWORD    total size in bytes
 04h    DWORD    offset
 08h    WORD    segment or selector
 0Ah    WORD    reserved
 0Ch    WORD    maximum number of physical blocks structure has space for
 0Eh    WORD    number of physical blocks listed
 10h    DWORD    physical address of first block
 14h    DWORD    size in bytes of first block
    ...
--------m-2F43E2-----------------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - ENABLE/DISABLE DPMS
    AX = 43E2h
    BX = new state (0000h disable, 0001h enable)
Return: AX = 0000h if supported
Note:    this function should normally be called only by system software
SeeAlso: AX=43E0h,AX=43E1h,AX=43E3h
--------m-2F43E3BX0000-----------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - DPMS STARTUP BROADCAST
    AX = 43E3h
    BX = 0000h
    CX = 4450h ('DP')
    DX = 4D53h ('MS')
SeeAlso: AX=43E0h,AX=43E4h
--------m-2F43E4BX0000-----------------------
INT 2F - DOS Protected Mode Services (DPMS) v1.0 - DPMS EXIT BROADCAST
    AX = 43E4h
    BX = 0000h
    CX = 4450h ('DP')
    DX = 4D53h ('MS')
SeeAlso: AX=43E0h,AX=43E3h
--------E-2F44-------------------------------
INT 2F U - DOS Extender support???
    AH = 44h
    AL = function (at least 0Bh, 15h, 17h)
    ???
Return: ???
Note:    called by Codeview for Windows
SeeAlso: AH=86h
--------G-2F4500-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - INSTALLATION CHECK
    AX = 4500h
Return: AL = installation status
        01h if PROF.COM installed
        02h if VPROD.386 installed
SeeAlso: AX=4501h,AX=4502h
--------G-2F4501-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SETUP PROFILER
    AX = 4501h
    BX = CSIPS buffer size in KB (first parameter for ProfSetup)
    CX = output limit in KB (second parameter for ProfSetup)
Note:    this call is not supported by PROF.COM
SeeAlso: AX=4502h,AX=4503h
--------G-2F4502-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - SET SAMPLING RATE
    AX = 4502h
    BL = sampling rate for PROF.COM (0 < BL <= 13)
        (01h = 8192/s, 04h = 1024/s, 08h = 32/s, 0Dh = 1/s)
    CX = sampling rate for VPROD.386
Note:    for PROF.COM, this programs the CMOS clock by setting BL+2 as the
      low four bits of CMOS register 0Ah.  The interruption rate is
      1 SHL (15 - BL) per second.
SeeAlso: AX=4501h,AX=4503h
--------G-2F4503-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - START PROFILING
    AX = 4503h
Notes:    Profiling is also turned on by the key combinations
      LeftShift + RightShift + Alt and LeftShift + RightShift + Ctrl
    for PROF.COM, this call programs the CMOS clock by reading register
      0Ch, and setting bit 6 of register 0Bh.  It then makes sure that IRQ8
      is unmasked
SeeAlso: AX=4504h
--------G-2F4504-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - STOP PROFILING
    AX = 4504h
Notes:    profiling is also turned off by the key combination
      LeftShift + RightShift
    for PROF.COM, this programs the CMOS clock by reading register 0Ch
      and clearing bit 6 of register 0Bh.  It then masks IRQ8.
SeeAlso: AX=4503h,AX=4505h,AX=4506h,AX=4507h
--------G-2F4505-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - CLEAR PROFILING DATA
    AX = 4505h
SeeAlso: AX=4503h,AX=4504h,AX=4506h
--------G-2F4506-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFlush"
    AX = 4506h
SeeAlso: AX=4505h,AX=4507h
--------G-2F4507-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - "ProfFinish"
    AX = 4507h
Note:    this call is essentially a "ProfStop" (AX=4504h) followed by
      "ProfFlush" (AX=4506h)
SeeAlso: AX=4504h,AX=4505h,AX=4506h
--------G-2F4508-----------------------------
INT 2F U - Microsoft Profiler (PROF.COM/VPROD.386) - ALTERNATE SEGDEBUG IFACE
    AX = 4508h
    BX = ordinal (or 0000h)
    CX = segment
    DX = instance (or 0000h)
    SI = type (or 0000h)
    ES:DI -> ASCIZ module name
Notes:    this call is an alternate entry to the profiler's SEGDEBUG
      interface, but only to function 0, for notifying the profiler of
      each new segment loaded.  The SHOWHITS utility then examines the
      profiler's output files (CSIPS.DAT and SEGENTRY.DAT) in conjunction
      with symbol files to provide information in a useful form.
    this call does not have a corresponding Windows function
SeeAlso: AX=4500h
--------D-2F4601-----------------------------
INT 2F CU - MS Windows WINOLDAP - SWITCHING ???
    AX = 4601h
Return: ???
Note:    the DOS 5+ kernel intercepts this function and copies the MCB
       following the caller's PSP memory block into the DOS data segment;
       in conjunction with AX=4602h, this intercept is used by DOS to
       avoid corruption of the Windows real-mode heap's end sentinel
SeeAlso: AX=1700h,AX=4602h
--------D-2F4602-----------------------------
INT 2F CU - MS Windows WINOLDAP - SWITCHING ???
    AX = 4602h
Return: ???
Note:    the DOS 5+ kernel intercepts this function and copies the
      previously-saved MCB from the DOS data segment into the MCB following
      the caller's PSP memory block; in conjunction with AX=4601h, this
      intercept is used by DOS to avoid corruption of the Windows real-mode
      heap's end sentinel
SeeAlso: AX=1700h,AX=4601h
--------E-2F46-------------------------------
INT 2F U - Windows/286 DOS Extender
    AH = 46h
    AL = subfunction (03h,04h)
Return: ???
Note:    these two subfunctions are called by MS Windows 3.0
--------v-2F4653CX0002-----------------------
INT 2F - F-PROT v1.x only - F-LOCK.EXE - API
    AX = 4653h
    CX = 0002h
    BX = subfunction
        0000h  installation check
        Return: AX = FFFFh
        0001h  uninstall
        Return: AX,BX,ES destroyed
        0002h  disable (v1.08 and below only)
        0003h  enable (v1.08 and below only)
Program: F-LOCK is part of the shareware F-PROT virus/trojan protection
      package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0003h,AX=CA00h,INT 21/AX=4BEEh
Index:    installation check;F-LOCK|uninstall;F-LOCK
--------v-2F4653CX0003-----------------------
INT 2F - F-PROT v1.x only - F-XCHK.EXE - API
    AX = 4653h
    CX = 0003h
    BX = subfunction
        0000h  installation check
        Return: AX = FFFFh
        0001h  uninstall
        Return: AX,BX,ES destroyed
Program: F-XCHK is part of the shareware F-PROT virus/trojan protection
      package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0002h,AX=4653h/CX=0004h,AX=CA00h
Index:    installation check;F-XCHK|uninstall;F-XCHK
--------v-2F4653CX0004-----------------------
INT 2F - F-PROT v1.x only - F-POPUP.EXE - API
    AX = 4653h
    CX = 0004h
    BX = subfunction
        0000h  installation check
        Return: AX = FFFFh
        0001h  uninstall
        Return: AX,BX,ES destroyed
        0002h  disable (v1.08 and below only)
           display message (v1.14+)
            other registers: ???
        0003h  enable (v1.08 and below only)
           display message (v1.14+)
            other registers: ???
            Return: AX = key pressed by user
Program: F-POPUP is part of the shareware F-PROT virus/trojan protection
      package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0003h,AX=4653h/CX=0005h,AX=CA00h
Index:    installation check;F-POPUP|uninstall;F-POPUP
--------v-2F4653CX0005-----------------------
INT 2F - F-PROT v1.x only - F-DLOCK.EXE - API
    AX = 4653h
    CX = 0005h
    BX = subfunction
        0000h installation check
        Return: AX = FFFFh
        0001h uninstall
        Return: AX,BX,ES destroyed
Program: F-DLOCK is part of the shareware F-PROT virus/trojan protection
      package by Fridrik Skulason
SeeAlso: AX=4653h/CX=0004h,AX=CA00h
Index:    installation check;F-DLOCK|uninstall;F-DLOCK
--------W-2F4680-----------------------------
INT 2F U - MS Windows v3.0 - INSTALLATION CHECK
    AX = 4680h
Return: AX = result
        0000h MS Windows 3.0 running in real (/R) or standard (/S) mode,
          or DOS 5 DOSSHELL active
        nonzero  no Windows, Windows prior to 3.0, or Windows3 in enhanced
          mode
Note:    Windows 3.1 finally provides an installation check which works in all
      modes (see AX=160Ah)
SeeAlso: AX=1600h,AX=160Ah
----------2F47-------------------------------
INT 2F U - ???
    AH = 47h
    ???
Return: ???
Note:    reportedly called by Microsoft BASIC Compiler v7.0
--------K-2F4800-----------------------------
INT 2F - DOS 5+ DOSKEY - INSTALLATION CHECK
    AX = 4800h
Return: AL = nonzero if installed (DOS 5.0 and 6.0 return AX=AA02h)
        ES = segment of DOSKEY resident portion
Note:    DOSKEY chains if AL is not 00h or 10h on entry
SeeAlso: AX=4800h"PCED",AX=4810h
--------K-2F4800-----------------------------
INT 2F - PCED v2.1 - INSTALLATION CHECK
    AX = 4800h
Return: AX = AACDh if installed
        ES = segment of PCED kernel (PCED has multiple code segments)
Program: PCED v2.1 is a command line editor/history/macro facility by
      Cove Software.  It is the commercial version of the freeware CED.
Notes:    DOSKEY also responds to this call if installed, returning AX=AA02h.
    unlike DOSKEY, PCED does *not* chain if AL contains an
      unsupported function code.  It IRETs with all registers intact.
--------K-2F4810-----------------------------
INT 2F - DOS 5+ DOSKEY, PCED v2.1 - READ INPUT LINE FROM CONSOLE
    AX = 4810h
    DS:DX -> line buffer (see #0647 at INT 21/AH=0Ah)
Return: AX = 0000h if successful
Notes:    the first byte (length) of the buffer MUST be 80h, or DOSKEY chains to
      the previous handler; PCED allows sizes other than 80h
    if the user's input is a macro name, no text is placed in the buffer
      even though AX=0000h on return; the program must immediately issue
      this call again to retrieve the expansion of the macro.  Similarly,
      if the user enters a special parameter such as $*, this call must
      be repeated to retrieve the expansion; on the second call, DOSKEY
      overwrites the macro name on the screen with its expansion.
    unlike DOSKEY, PCED expands all macros on the first call, so it is
      not necessary to make two calls; since the buffer is not empty on
      return, DOSKEY-aware programs will not make the second call
    DOSKEY chains if AL is not 00h or 10h on entry
SeeAlso: AX=4800h,INT 21/AH=0Ah
--------K-2F48C0-----------------------------
INT 2F - PCED v2.1 - PCED API
    AX = 48C0h
    DX = API function code
    other registers as required by the specified function
Return: CF clear if successful
    CF set on error
        AX = PCED error code
    other registers as appropriate for API function
Program: PCED v2.1 is a command line editor/history/macro facility by
      Cove Software.  It is the commercial version of the freeware CED.
Note:    the full API information is available from Cove Software
SeeAlso: AX=4800h"PCED",AX=48C1h,AX=48C2h,AX=48C3h
--------U-2F48C1BL00-------------------------
INT 2F - PCED/VSTACK - INSTALLATION CHECK
    AX = 48C1h
    BL = 00h
Return: AX = 0000h if installed
        BX = VSTACK resident segment
Program: VSTACK is a resident backscroll utility included as part of the PCED
      package by Cove Software
Note:    chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C2h
--------U-2F48C2BL00-------------------------
INT 2F - PCED/ATTRIB - INSTALLATION CHECK
    AX = 48C2h
    BL = 00h
Return: AX = 0000h if installed
        BX = ATTRIB resident segment
Program: ATTRIB is a resident file attribute changer included as part of the
      PCED package by Cove Software
Note:    chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C1h,AX=48C3h
--------K-2F48C3BL00-------------------------
INT 2F - PCED/KEYDEF - INSTALLATION CHECK
    AX = 48C3h
    BL = 00h
Return: AX = 0000h if installed
        BX = KEYDEF resident segment
Program: KEYDEF is a resident keyboard redefinition utility included as part
      of the PCED package by Cove Software
Note:    chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C2h,AX=48C4h
--------U-2F48C4BL00-------------------------
INT 2F - PCED/FLIST - INSTALLATION CHECK
    AX = 48C4h
    BL = 00h
Return: AX = 0000h if installed
        BX = FLIST resident segment
Program: FLIST is a resident filelist processor included as part of the PCED
      package by Cove Software
Note:    chains if BL <> 00h on entry
SeeAlso: AX=48C0h,AX=48C3h,AX=48C5h
--------U-2F48C5BL00-------------------------
INT 2F - PCED/ASSOC - INSTALLATION CHECK
    AX = 48C5h
    BL = 00h
Return: AX = 0000h if installed
        BX = ASSOC resident segment
Program: ASSOC is a resident utility included as part of the PCED package which
      associated files with executable programs based on their extensions
Note:    chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C4h,AX=48C5h/BL=01h,AX=48C5h/BL=02h
--------U-2F48C5BL01-------------------------
INT 2F - PCED/ASSOC - GET VERSION
    AX = 48C5h
    BL = 01h
Return: AX = 0000h if installed
        BX = binary ASSOC version (BL = major, BH = minor)
Note:    chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=02h
--------U-2F48C5BL02-------------------------
INT 2F - PCED/ASSOC - ASSOCIATION TEST
    AX = 48C5h
    BL = 02h
    DS:SI -> ASCIZ filename
Return: AX = status
        0000h if filename is unknown
        0001h if there is an association defined for the file
    BX destroyed
Program: ASSOC is a resident utility included as part of the PCED package which
      associated files with executable programs based on their extensions
Note:    chains if BL > 02h on entry
SeeAlso: AX=48C0h,AX=48C5h/BL=00h,AX=48C5h/BL=01h
----------2F49-------------------------------
INT 2F U - ???
    AH = 49h
    ???
Return: ???
Note:    reportedly called by DOS 5.0 installation
--------D-2F4A00CX0000-----------------------
INT 2F CU - DOS 5+ - FLOPPY-DISK LOGICAL DRIVE CHANGE NOTIFICATION
    AX = 4A00h
    CX = 0000h
    DH = new drive number
    DL = current drive number
Return: CX = FFFFh to skip "Insert diskette for drive X:" message
Note:    called by MS-DOS 5.0+ IO.SYS just before displaying the message
      "Insert diskette for drive X:" on single-floppy systems
--------D-2F4A01-----------------------------
INT 2F - DOS 5+ - QUERY FREE HMA SPACE
    AX = 4A01h
Return: BX = number of bytes available in HMA (0000h if DOS not using HMA)
    ES:DI -> start of available HMA area (FFFFh:FFFFh if not using HMA)
Notes:    called by Windows 3.1 DOSX.EXE
    supported by Novell DOS 7
SeeAlso: AX=4310h,AX=4A02h
--------D-2F4A02-----------------------------
INT 2F - DOS 5+ - ALLOCATE HMA SPACE
    AX = 4A02h
    BX = number of bytes
Return: ES:DI -> start of allocated HMA block or FFFFh:FFFFh
    BX = number of bytes actually allocated (rounded up to next paragraph
          for DOS 5.0 and 6.0)
Notes:    this call is not valid unless DOS is loaded in the HMA (DOS=HIGH)
    called by Windows 3.1 DOSX.EXE
    supported by Novell DOS 7
SeeAlso: AX=4A01h
--------T-2F4A05-----------------------------
INT 2F U - DOS 5+ DOSSHELL - TASK SWITCHING API???
    AX = 4A05h
    SI = function
        0000h reset???
        0001h ???
        ES:BP -> 80-byte buffer containing ???
        0002h ???
        0003h ???
        0004h ???
        BL = ???
        0005h ???
        0006h get ???
        Return: ES:SI -> ???
        0007h get ???
        Return: AX = ???
        0008h get ???
        Return: DX:AX -> ??? (internal control data of some kind)
        0009h get ???
        Return: ES:SI -> ??? (apparently identical to function 0006h)
        000Ah ???
        BL = length of buffer
        ES:BP -> buffer containing ???
        000Bh get ???
        Return: AX = ???
        000Ch ???
        BL = ???
        Return: if BL nonzero on entry
                DX:AX -> ???
            if BL = 00h on entry
                ES:SI -> ???
Notes:    DOSSHELL chains to the previous handler if SI is not one of the values
      listed above
    the DOSSWAP.EXE module calls functions 03h,04h,05h,07h,08h,09h,0Ch
    the Windows 3.1 DSWAP.EXE and WSWAP.EXE task switchers use these calls
SeeAlso: AX=4B01h
--------D-2F4A06-----------------------------
INT 2F CU - DOS 5+ - DOS SUPERVISOR "REBOOT PANEL" - ADJUST MEMORY SIZE
    AX = 4A06h
    DX = segment following last byte of conventional memory
Return: DX = segment following last byte of memory available for use by DOS
Desc:    used to override the default memory size when booting diskless
      workstations
Notes:    called by MS-DOS 5+ IO.SYS startup code if the signature "RPL" is
      present three bytes beyond the INT 2F handler; this call overrides
      the value returned by INT 12
    hooked by RPL code at the top of memory to protect itself from being
      overwritten; DOS builds a memory block with owner = 0008h and name
      "RPL" which must be freed by the RPL code when it is done
SeeAlso: INT 12,INT 18
--------N-2F4A07-----------------------------
INT 2F U - RESERVED FOR PROTMAN SUPPORT
    AX = 4A07h
    ???
Return: ???
--------c-2F4A10BX0000-----------------------
INT 2F - SMARTDRV v4.00+ - INSTALLATION CHECK AND HIT RATIOS
    AX = 4A10h
    BX = 0000h
    CX = EBABh (v4.1+; see Note)
Return: AX = BABEh if installed
        DX:BX = cache hits
        DI:SI = cache misses
        CX = number of dirty cache elements
        BP = version in BCD (4.10 = 0410h)
Notes:    most of the SMARTDRV API, including this call, is supported by
      PC-Cache v8.0 and recent versions of the Norton Caches
    if DBLSPACE.BIN is installed but SMARTDRV has not yet been installed,
      then calls of this function with CX<>EBABh on entry cause
      DBLSPACE.BIN to display the error message
      "Cannot run SMARTDrive 4.0 with DoubleSpace" and abort the caller
      with INT 21/AX=4C00h
    SMARTDRV v3.x had a completely different API using IOCTL calls, which
      was also supported by the Norton Caches
SeeAlso: AX=4A10h/BX=0001h,AX=4A10h/BX=0004h,AX=4A10h/BX=0005h
SeeAlso: AX=4A10h/BX=0007h,AX=4A10h/BX=1234h,AX=4A11h/BX=0000h
SeeAlso: INT 21/AX=4402h"SMARTDRV",INT 21/AX=4403h"SMARTDRV"
--------c-2F4A10BX0000-----------------------
INT 2F U - Novell NWCACHE - ???
    AX = 4A10h
    BX = 0000h
    CX = 0EDCh ('EDC' = Novell European Development Center)
Return: ???
SeeAlso: AX=4A10h/BX=0001h"NWCACHE"
--------c-2F4A10BX0001-----------------------
INT 2F - SMARTDRV v4.00+ - FLUSH BUFFERS (COMMIT CACHE)
    AX = 4A10h
    BX = 0001h
Note:    this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0002h
--------c-2F4A10BX0001-----------------------
INT 2F U - Novell NWCACHE - ???
    AX = 4A10h
    BX = 0001h
    CX = 0EDCh ('EDC' = Novell European Development Center)
Return: ???
SeeAlso: AX=4A10h/BX=0000h"NWCACHE"
--------c-2F4A10BX0002-----------------------
INT 2F - SMARTDRV v4.00+ - RESET CACHE
    AX = 4A10h
    BX = 0002h
Note:    this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0001h
--------c-2F4A10BX0003-----------------------
INT 2F - SMARTDRV v4.00+ - STATUS
    AX = 4A10h
    BX = 0003h
    BP = drive number (0=A, 1=B, etc.)
    DL = subfunction
        00h only get information
        01h turn on read cache
        02h turn off read cache
        03h turn on write cache
        04h turn off write cache
Return: AX = BABEh if OK
    DL = status (see #1989)
    DL = FFh if drive does not exist
Notes:    If the read cache is off, reads will not be cached, but writes will
      continue to be cached if the write-cache is enabled.
    this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h

Bitfields for SMARTDRV status:
Bit(s)    Description    (Table 1989)
 7    not cached
 6    write-through (not write-cached)
 0-5    real drive number (0=A, 1=B...)
--------c-2F4A10BX0004-----------------------
INT 2F - SMARTDRV v4.00+ - GET CACHE SIZE
    AX = 4A10h
    BX = 0004h
Return: AX = size in elements of full-sized cache
    BX = current size in elements
    CX = size of one element in bytes
    DX = number of elements under Windows
Note:    this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0005h
--------c-2F4A10BX0005-----------------------
INT 2F - SMARTDRV v4.00+ - GET DOUBLE-BUFFER STATUS
    AX = 4A10h
    BX = 0005h
    BP = drive number (0=A, 1=B...)
Return: AX = BABEh if double-buffered
        ES:DI -> 16-byte array of status bytes for fixed disks (see #1990)
SeeAlso: AX=4A10h/BX=0000h,AX=4A10h/BX=0003h,AX=4A10h/BX=0006h

(Table 1990)
Values for SMARTDRV status byte:
 00h    state unknown
 FFh    drive double-buffered
 else    not double-buffered
--------c-2F4A10BX0006-----------------------
INT 2F CU - SMARTDRV v4.00+ - CHECK IF DRIVE CACHEABLE
    AX = 4A10h
    BX = 0006h
    CL = drive number (01h = A:)
Return: AX = 0006h if drive should not be cached by SMARTDRV
Note:    called by SMARTDRV at startup to determine whether it should cache
      a particular drive
SeeAlso: AX=4A10h/BX=0000h
--------c-2F4A10BX0007-----------------------
INT 2F - SMARTDRV v4.00+ - GET DEVICE DRIVER FOR DRIVE
    AX = 4A10h
    BX = 0007h
    BP = drive number (00h=A:)
Return: DL = unit number within device driver
    ES:DI -> device driver header for drive
Note:    this function is also supported by PC-Cache v8.0.
    this call is reported to always return the driver header of the
      standard block driver (A:-C:+) for SmartDrive v5.00 from MS-DOS 6.2
SeeAlso: AX=4A10h/BX=0000h,AX=4A11h/BX=0003h,AX=4A11h/BX=0004h
--------c-2F4A10BX0008-----------------------
INT 2F - SMARTDRV v4.20+ - GET/SET FLUSH BEFORE PROMPT, CD-ROM SUPPORT
    AX = 4A10h
    BX = 0008h
    DL = subfunction
        00h set
        DH = new states
            bit 0: flush before prompt
            bits 1-7 reserved (0)
        01h get
        Return: DH = status flags
                bit 0: (v4.2+) flush before prompt
                bit 1: (v5.0+) CD-ROM caching support installed
Note:    v4.2 was an interim release to fix problems in the SMARTDRV included
      with MS-DOS 6.00; v5.00 is included with MS-DOS 6.2
--------c-2F4A10BX000A-----------------------
INT 2F - SMARTDRV v4.00+ - GET ELEMENT STATUS TABLE
    AX = 4A10h
    BX = 000Ah
Return: ES:BX -> information pointer table (see #1991)
Note:    this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h

Format of SMARTDRV information pointer table:
Offset    Size    Description    (Table 1991)
 00h    WORD    offset of ??? byte/word array (byte if elements < 2000h bytes)
 02h    WORD    offset of dirty flag byte/word array (byte if elts < 2000h)
        each byte/word is a bit string of the dirty sectors in element
 04h    WORD    offset of word array containing low halves of unique
          identifiers for the corresponding element's contents
 06h    WORD    offset of word array containing high halves of unique
          identifiers for the corresponding element's contents
 08h    WORD    offset of WORD containing current number of elements in cache
--------c-2F4A10BX1234-----------------------
INT 2F - SMARTDRV v4.00+ - SIGNAL SERIOUS ERROR
    AX = 4A10h
    BX = 1234h
Desc:    this function pops up a message box saying that a serious error
      occurred and to hit R to retry, then waits for the keypress
Note:    this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h
--------k-2F4A11BX0000-----------------------
INT 2F - DBLSPACE.BIN - "GetVersion" - INSTALLATION CHECK
    AX = 4A11h
    BX = 0000h
Return: AX = 0000h (successful)
    BX = 444Dh ("DM")
    CL = first drive letter used by DBLSPACE (41h ['A'] = A:)
    CH = number of drive letters used by DBLSPACE
    DX = internal DBLSPACE.BIN version number (bits 14-0)
        bit 15 set if DBLSPACE.BIN has not yet been relocated to final
          position in memory (i.e. DBLSPACE.SYS /MOVE)
Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the
      disk-compression software bundled with MS-DOS 6.0 and 6.20
Notes:    this function is also supported by the version of SuperStor bundled
      with IBM DOS 6.x and "preloading" versions of Stacker
    the complete DBLSPACE.BIN API is still supported by MS-DOS 6.22's
      DRVSPACE.BIN
SeeAlso: AX=4A11h/BX=0001h,AX=4A11h/BX=0002h,AX=4A11h/BX=0003h
SeeAlso: AX=4A11h/BX=0005h,AX=4A11h/BX=0007h,AX=4A11h/BX=FFFFh
SeeAlso: INT 21/AX=4404h"DBLSPACE"
--------k-2F4A11BX0001-----------------------
INT 2F - DBLSPACE.BIN - "GetDriveMapping" - GET DRIVE MAPPING
    AX = 4A11h
    BX = 0001h
    DL = drive number (0=A:)
Return: AX = status (see also #1992)
        0000h successful
        if DL was compressed drive,
            BL = host drive (bit 7 set if drive is compressed)
        else if DL was host drive,
            BL = compressed drive
        else
            BL = specified drive (if available for DoubleSpace)
        BH = DoubleSpace sequence number
        other error code (0101h) (see #1992)
        apparently never returned for the MS-DOS 6.2 DoubleSpace
Note:    the compressed volume file for the specified compressed drive is
      host:\DBLSPACE.sequence
SeeAlso: AX=4A11h/BX=0000h

(Table 1992)
Values for DBLSPACE function status:
 0000h    successful
 0100h    bad function
 0101h    invalid drive
 0102h    not a compressed drive
 0103h    drive already swapped
 0104h    drive not swapped
--------k-2F4A11BX0002-----------------------
INT 2F - DBLSPACE.BIN - "Swap Drive" - SWAP DRIVE LETTERS OF CVF AND HOST DRIVE
    AX = 4A11h
    BX = 0002h
    DL = drive number (0=A:) of compressed drive to swap with its host
Return: AX = status (0000h,0101h,0102h,0103h) (see #1992)
Note:    this function is intended for use by DBLSPACE.EXE only
SeeAlso: AX=4A11h/BX=0000h
--------k-2F4A11BX0003-----------------------
INT 2F - DBLSPACE.BIN - "DSGetEntryPoints" - GET DEVICE DRIVER ENTRY POINTS
    AX = 4A11h
    BX = 0003h
    CL = drive number (0=A:) of compressed drive
Return: CL = FFh on error (not compressed drive)
    CL <> FFh driver unit number of host drive
        ES:SI -> device driver's strategy routine
        ES:DI -> device driver's interrupt routine
    BX destroyed
Note:    in conjunction with subfunction 0004h, this call allows disk caches
      like SMARTDRV to apply a device driver wrapper to DoubleSpaced
      drives just like SMARTDRV applies to regular block devices
SeeAlso: AX=4A10h/BX=0007h,AX=4A11h/BX=0000h,AX=4A11h/BX=0004h
--------k-2F4A11BX0004-----------------------
INT 2F - DBLSPACE.BIN - "DSSetEntryPoints" - SET DEVICE DRIVER ENTRY POINTS
    AX = 4A11h
    BX = 0004h
    CL = drive number (0=A:) of compressed drive
    DL = unit number for new driver entry points
    DH = 00h
    ES:SI -> device driver strategy routine to call for drive
    ES:DI -> device driver interrupt routine to call for drive
Return: CL = FFh on error (not a compressed drive)
    BX destroyed
Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the
      disk-compression software bundled with MS-DOS 6.0
Note:    in conjunction with subfunction 0003h, this call allows disk caches
      like SMARTDRV to apply a device driver wrapper to DoubleSpaced
      drives just like SMARTDRV applies to regular block devices
SeeAlso: AX=4A10h/BX=0007h,AX=4A11h/BX=0000h,AX=4A11h/BX=0003h
--------k-2F4A11BX0005-----------------------
INT 2F - DBLSPACE.BIN - "ActivateDrive" - MOUNT COMPRESSED DRIVE
    AX = 4A11h
    BX = 0005h
    DL = drive number (0=A:) to assign to new drive
    ES:SI -> activation record (see #1993)
Return: status returned in activation record (see #1994)
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0006h

Format of DBLSPACE activation record:
Offset    Size    Description    (Table 1993)
 00h  2 BYTEs    signature "MD" (4Dh 44h)
 02h    BYTE    4Dh ('M') mount command
 03h    BYTE    error code (set to FFh before calling) (see #1994)
 04h    BYTE    host drive number (0=A:)
 05h    ???    DISK_UNIT structure (not documented)

(Table 1994)
Values for DBLSPACE Mount error code:
 00h    successful
 01h    drive letter not available for DoubleSpace
 02h    drive letter already in use
 03h    no more disk units (increase MaxRemovableDrives in .INI)
 09h    CVF too fragmented
--------k-2F4A11BX0006-----------------------
INT 2F - DBLSPACE.BIN - "DeactivateDrive" - UNMOUNT COMPRESSED DRIVE
    AX = 4A11h
    BX = 0006h
    DL = drive number (0=A:) to unmount
Return: AX = status (0000h,0102h) (see #1992)
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0005h
--------k-2F4A11BX0007-----------------------
INT 2F - DBLSPACE.BIN - "GetDriveSpace" - GET SPACE AVAIL ON COMPRESSED DRIVE
    AX = 4A11h
    BX = 0007h
    DL = compressed drive number (0=A:)
Return: AX = status (0000h,0102h) (see also #1992)
        0000h successful
        DS:SI -> free space record (see #1995)
Program: DBLSPACE.BIN is the resident driver for DoubleSpace, the
      disk-compression software bundled with MS-DOS 6.0
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h

Format of DBLSPACE free space record:
Offset    Size    Description    (Table 1995)
 00h    DWORD    total number of sectors in drive's sector heap
 04h    DWORD    number of free sectors in drive's sector heap
--------k-2F4A11BX0008-----------------------
INT 2F - DBLSPACE.BIN - "GetFileFragmentSpace" - GET SIZE OF FRAGMENT HEAP
    AX = 4A11h
    BX = 0008h
    DL = compressed drive number (0=A:)
Return: AX = status (0000h,0102h) (see also #1992)
        0000h successful
        BX = maximum entries in File Fragment heap
        CX = available entries in File Fragment heap
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0007h,AX=4A11h/BX=0009h
--------k-2F4A11BX0009-----------------------
INT 2F - DBLSPACE.BIN - "GetExtraInfo" - DETERMINE NUMBER OF DISK_UNIT STRUCTS
    AX = 4A11h
    BX = 0009h
    DL = compressed drive number (0=A:)
Return: AX = status (see also #1992)
        0000h successful
        CL = number of DISK_UNIT structures allocated
              (see AX=4A11h/BX=0005h)
        CH = DoubleGuard enabled-checks bitflags in bits 6-0 (DOS 6.2)
Note:    the DoubleGuard checks are enabled or disabled as a block by the
      DoubleGuard= line in DBLSPACE.INI; they may be individually set with
      the CheckSum= line.
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=0008h
--------k-2F4A11BX000A-----------------------
INT 2F - DBLSPACE.BIN v6.2 - SET AUTOMOUNT DRIVES
    AX = 4A11h
    BX = 000Ah
    CX:DX = bitmask of drives on which to enable AutoMount
        (DX bit 0 = A:, CX bit 0 = P:, etc.)
Return: AX = 0000h if supported
        CX:DX = old mask or 0000h:0000h on error
    BX destroyed
SeeAlso: AX=4A11h/BX=000Bh
--------k-2F4A11BX000B-----------------------
INT 2F - DBLSPACE.BIN v6.2 - GET AUTOMOUNT DRIVES
    AX = 4A11h
    BX = 000Bh
Return: AX = 0000h if supported
        CX:DX = mask of drives with AutoMount enabled
        0000h:0000h on error
    BX destroyed
SeeAlso: AX=4A11h/BX=000Ah
--------k-2F4A11BXFFFE-----------------------
INT 2F U - DBLSPACE.BIN - RELOCATE
    AX = 4A11h
    BX = FFFEh
    ES = segment to which to relocate DBLSPACE.BIN
Return: ???
Notes:    called by DBLSPACE.SYS to relocate DBLSPACE.BIN to its final position
      in memory
    this function also unhooks and discards the code providing this
      function and AX=4A11h/BX=FFFFh
    this function is also supported by the version of SuperStor bundled
      with IBM DOS 6.x and "preloading" versions of Stacker
SeeAlso: AX=4A11h/BX=FFFFh
--------k-2F4A11BXFFFF-----------------------
INT 2F U - DBLSPACE.BIN - GET RELOCATION SIZE
    AX = 4A11h
    BX = FFFFh
Return: AX = number of paragraphs needed by DBLSPACE.BIN
Note:    used by DBLSPACE.SYS to relocate the DBLSPACE driver to its final
      position in memory
    this function is also supported by the version of SuperStor bundled
      with IBM DOS 6.x and "preloading" versions of Stacker
SeeAlso: AX=4A11h/BX=0000h,AX=4A11h/BX=FFFEh
--------k-2F4A12CX4D52-----------------------
INT 2F - Microsoft Realtime Compression Interface (MRCI) - RAM-BASED SERVER
    AX = 4A12h
    CX = 4D52h ("MR")
    DX = 4349h ("CI")
Return: CX = 4943h ("IC") if installed
    DX = 524Dh ("RM") if installed
        ES:DI -> MRCINFO structure (see #0578 at INT 1A/AX=B001h)
Note:    this call is functionally identical to INT 1A/AX=B001h, but should be
      called first, as the latter call is used for the first, ROM-based
      MRCI server, while this call is used for RAM-based servers which
      may be partially or entirely replacing a prior server
SeeAlso: AX=4A12h/CX=5354h,INT 1A/AX=B001h
--------k-2F4A12CX5354-----------------------
INT 2F - Stacker 4 LZS Compression Interface (LZSAPI)
    AX = 4A12h
    CX = 5354h ("ST")
    DX = 4143h ("AC")
Return: AX = 4F4Bh ("OK") if installed
    CX = 7374h ("st") if installed
    DX = 6163h ("ac") if installed
        ES:DI -> entry point in LZSAPI server (usually, driver
              STACKER.COM) containing far address of an actual
              LZSINFO structure (see #1996)
SeeAlso: AX=4A12h/CX=4D52h,INT 25/AX=CDCDh

Format of LZSINFO structure:
Offset    Size    Description    (Table 1996)
 00h  6 BYTEs    signature "LZSAPI"
 06h    WORD    server version (200 (0C8h) for Stacker 4 and Stacker Anywhere)
 08h  4 BYTEs    vendor signature
        "STAC" = Stac Electronics, Inc.
 0Ch  6 BYTEs    ???
 12h    WORD    bit flags: server status/capabilities (see #1997)
 14h    DWORD    -> Stacker 3.X-compatible compression procedure
 18h    DWORD    -> Stacker 3.X-compatible decompression procedure
 1Ch  4 BYTEs    reserved (always set to 0)
 20h    DWORD    -> incremental Stacker 3.x-compatible compression procedure
          (see #1998)
 24h  4 BYTEs    ???
 28h    DWORD    -> incremental Stacker 3.x-compatible decompression procedure
          (see #1999)
 2Ch  4    BYTES    ???
 30h    DWORD    -> new (Stacker 4) compression procedure
 34h  4 BYTEs    ???
 38h    DWORD    -> new (Stacker 4) decompression procedure
Notes:    Stacker 4 usally keeps two different data-compression algorithms in
      memory (preferably in XMA):
        1) new (Stacker 4) data compression algorithm (4K LZ77 with hashing
          and static Huffman encoding), and
        2) old (Stacker 3.x-compatible) one (2K LZ77 with hashing), which
          is used to work with STACVOL files created under older
          versions of Stacker.

Bitfields for LZSAPI capabilities:
Bit(s)    Description    (Table 1997)
 0    ???
 1    busy/error flag
 2-10    ???
 11    maximum compressor/decompressor presented

(Table 1998)
Call Stacker 3.x-style non-incremental functions with:
    STACK:    DWORD    return address for compress/decompress procedure
        WORD    compression algorithm parameters (see #2000)
        WORD    size of destination buffer (in bytes)
        DWORD    address of destination buffer
        WORD    size of source buffer (in bytes)
        DWORD    address of source buffer
Return: (compression/decompression procedure)
    AX = size of resulting data in destination buffer
        0000h if error (either destination buffer too small or error in
          compressed data)

(Table 1999)
Call Stacker 4-style incremental procedures with:
    STACK:    DWORD    return address for compr./decompr. procedure
        DWORD    address of LZSSWAP structure (see #2001)
            if 0000:0000, procedure uses non-incremental technique
        WORD    compression algorithm parameters (see #2000)
        WORD    size of destination buffer (in bytes)
        DWORD    address of destination buffer
        WORD    size of source buffer (in bytes)
        DWORD    address of source buffer

(Table 2000)
Values for Compression algorithm parameters:
Value    Compression level (/P=xx parameter)
 07F9h      1
 0621h      2
 0625h      3
 0665h      4
 0669h      5
 06E9h      6
 06EDh      7
 07D1h      8
 07D9h      9

Format of LZSSWAP structure:
Offset    Size    Description    (Table 2001)
 00h  2 BYTEs    signature "CS"
 02h  6 BYTEs    reserved
 08h    DWORD    address of destination buffer swapping procedure
 0Ch    DWORD    address of stack swapping procedure
--------k-2F4A13-----------------------------
INT 2F U - DBLSPACE.BIN - GET ??? ENTRY POINTS
    AX = 4A13h
Return: AX = 134Ah if supported
        ES:BX -> entry point record (see #2002)
SeeAlso: AX=4A11h/BX=0000h

Format of DBLSPACE entry point record:
Offset    Size    Description    (Table 2002)
 00h    DWORD    pointer to FAR function for ???
 04h  5 BYTEs    FAR JUMP instruction to ???
--------N-2F4B-------------------------------
INT 2F - LAN Manager 2.0 DOS Enh NETWKSTA.EXE - NETWORK WORKSTATION REDIRECTOR
    AH = 4Bh
    ???
Return: ???
Note:    LAN Manager enhanced mode adds features beyond the standard redirector
      file/printer services
SeeAlso: AX=118Ah,AX=4100h,AH=42h
--------T-2F4B01-----------------------------
INT 2F C - DOS 5+ TASK SWITCHER - BUILD CALLOUT CHAIN
    AX = 4B01h
    CX:DX -> task switcher entry point (see #2005)
    ES:BX = 0000h:0000h
Return: ES:BX -> callback info structure (see #2003) or 0000h:0000h
Notes:    called by the task switcher
    this function is hooked by clients which require notification of task
      switcher activities; the call must first be passed on to the prior
      handler with registers unchanged using a simulated interrupt.     On
      return, the client must build a callback info structure and store
      the returned ES:BX in the "next" field, then return the address of
      its own callback info structure.
    a client program must add itself to the notification chain if it
      provides services to other programs; before terminating, it must
      remove itself from the chain by calling the task switcher's entry
      point with AX=0005h (see #2005)
    the task switcher entry point should not be saved, as it is subject to
      change and will be provided on any notification call
    the Windows 3.1 Standard Mode supports this API
SeeAlso: AX=160Bh,AX=4B02h

Format of task switcher callback info structure:
Offset    Size    Description    (Table 2003)
 00h    DWORD    pointer to next callback info structure
 04h    DWORD    pointer to notification function (see #2004)
 08h    DWORD    reserved
 0Ch    DWORD    address of zero-terminated list of API info structures
        (see #2007)

(Table 2004)
Values task switcher notification function is called with:
    AX = function
        0000h switcher initialization
        Return: AX = status
                0000h if OK to load
                nonzero to abort task switcher
        0001h query suspend
        BX = session ID
        Return: AX = status
                0000h if OK to switch session
                0001h if not
        0002h suspend session
        BX = session ID
        interrupts disabled
        Return: AX = 0000h if OK to switch session
               = 0001h if not
        0003h activate session
        BX = session ID
        CX = session status flags
            bit 0: set if first activation of session
            bits 1-15: reserved (0)
        interrupts disabled
        Return: AX = 0000h
        0004h session active
        BX = session ID
        CX = session status flags
            bit 0: set if first activation of session
            bits 1-15: reserved (0)
        Return: AX = 0000h
        0005h create session
        BX = session ID
        Return: AX = 0000h if OK to create session
               = 0001h if not
        0006h destroy session
        BX = session ID
        Return: AX = 0000h
        0007h switcher termination
        BX = flags
            bit 0: set if calling switcher is only switcher loaded
            bits 1-15: reserved (0)
        Return: AX = 0000h
    ES:DI -> task switcher entry point (see #2005)
Notes:    function 0000h is generally called by the program which controls or
      invokes the task switcher, rather than by the task switcher itself;
      the entry point supplied to this function is not necessarily the
      entry point to the task switcher itself, and may be 0000h:0000h.  If
      any client indicates that loading is not possible, all clients will
      be called with function 0007h; thus it is possible for a client to
      receive a termination notice without a corresponding initialization
      notice.
    except for functions 0002h and 0003h, the notification handler is
      called with interrupts enabled and may make any INT 21h function
      call; interrupts must not be enabled in functions 0002h and 0003h
    function 0007h may be called with ES:DI = 0000h:0000h if the entry
      point is no longer valid
--------T-2F4B02BX0000-----------------------
INT 2F - DOS 5+ TASK SWITCHER - INSTALLATION CHECK
    AX = 4B02h
    BX = 0000h
    ES:DI = 0000h:0000h
Return: ES:DI = 0000h:0000h if task switcher not loaded
    ES:DI -> task switcher entry point (see #2005) if loaded
        AX = 0000h
Notes:    the returned entry point is that for the most-recently loaded task
      switcher; the entry points for prior task switchers may be determined
      with the "get version" call (see #2005)
    this function is supported by PC Tools v8+ CPTASK
SeeAlso: AX=4A05h,AX=4B03h

(Table 2005)
Call task switcher entry point with:
    AX = 0000h get version
        Return: CF clear if successful
                AX = 0000h
                ES:BX -> task switcher version struct (see #2006)
            CF set if unsupported function
    AX = 0001h test memory region
        ES:DI -> first byte to be tested
        CX = size of region to test
        Return: CF clear if successful
                AX = memory type of tested region
                0000h global
                0001h global and local
                0002h local (replaced on session switch)
            CF set if unsupported function
    AX = 0002h suspend switcher
        ES:DI -> new task switcher's entry point
        Return: CF clear if successful
                AX = state
                0000h switcher has been suspended
                0001h switcher not suspended, new switcher must
                    abort
                0002h switcher not suspended, but new switcher
                    may run anyway
            CF set if unsupported function
    AX = 0003h resume switcher
        ES:DI -> new task switcher's entry point
        Return: CF clear if successful
                AX = 0000h
            CF set if unsupported function
    AX = 0004h hook notification chain
        ES:DI -> callback info structure to be added to chain
              (see #2003)
        Return: CF clear if successful
                AX = 0000h
            CF set if unsupported function
    AX = 0005h unhook notification chain
        ES:DI -> callback info structure to be removed from chain
              (see #2003)
        Return: CF clear if successful
                AX = 0000h
            CF set if unsupported function
    AX = 0006h query API support
        BX = asynchronous API identifier
        Return: CF clear if successful
                AX = 0000h
                ES:BX -> API info structure (see #2007) for the
                      client which provides the highest
                      level of API support
            CF set if unsupported function

Format of task switcher version structure:
Offset    Size    Description    (Table 2006)
 00h    WORD    major version of supported protocol  (current protocol is 1.0)
 02h    WORD    minor version of supported protocol
 04h    WORD    major version of task switcher
 06h    WORD    minor version of task switcher
 08h    WORD    task switcher ID (see AX=4B03h)
 0Ah    WORD    operation flags
        bit 0: set if task switcher disabled
        bits 1-15: reserved (0)
 0Ch    DWORD    pointer to ASCIZ task switcher name
        ("MS-DOS Shell Task Switcher" for DOSSHELL task switcher)
 10h    DWORD    pointer to previous task switcher's entry point or 0000h:0000h

Format of API info structure:
Offset    Size    Description    (Table 2007)
 00h    WORD    size of structure in bytes (000Ah)
 02h    WORD    API identifier
        0001h NetBIOS
        0002h 802.2
        0003h TCP/IP
        0004h LAN Manager named pipes
        0005h Novell NetWare IPX
 04h    WORD    major version \ of highest version of API for which the support
 06h    WORD    minor version / level specified in the next field is provided
 08h    WORD    support level
        0001h minimal support
        0002h API-level support
        0003h switcher compatibility
        0004h seamless compatibility
--------T-2F4B03-----------------------------
INT 2F - DOS 5+ TASK SWITCHER - ALLOCATE SWITCHER ID
    AX = 4B03h
    ES:DI -> task switcher entry point (see #2005)
Return: AX = 0000h
    BX = switcher ID (0001h-000Fh), or 0000h if no more available
Notes:    if a task switcher has determined that it is the first to be loaded, it
      must allocate an identifier for itself and provide this function to
      all subsequent task switchers; if it is not the first to be loaded,
      it must call this function to allocate an ID.     The switcher ID is
      used as the high four bits of all session identifiers to ensure
      unique session IDs.
    if no more switcher IDs are available, the new task switcher making the
      call must terminate or disable itself
    the task switcher providing the identifiers may call the new task
      switcher's entry point as needed
    this call is available from within DOSSHELL even if the task switcher
      is not installed
    this function is supported by PC Tools v8+ CPTASK, but appears to
      always return an ID of 0000h
SeeAlso: AX=4B02h,AX=4B04h
--------T-2F4B04-----------------------------
INT 2F - DOS 5+ TASK SWITCHER - FREE SWITCHER ID
    AX = 4B04h
    BX = switcher ID
    ES:DI -> task switcher entry point (see #2005)
Return: AX = 0000h
    BX = status
        0000h successful
        other error (invalid ID or ID not allocated)
Notes:    called by a task switcher when it exits, unless it was the first loaded
      and is providing the support for AX=4B03h and AX=4B04h
    the task switcher providing the identifiers may call the terminating
      task switcher's entry point as needed
    this call is available from within DOSSHELL even if the task switcher
      is not installed
    this call is supported by PC Tools v8+ CPTASK, but appears to return
      sucessfully no matter which ID is given
SeeAlso: AX=4B02h,AX=4B03h
--------T-2F4B05-----------------------------
INT 2F C - DOS 5+ TASK SWITCHER - IDENTIFY INSTANCE DATA
    AX = 4B05h
    ES:BX = 0000h:0000h
    CX:DX -> task switcher entry point (see #2005)
Return: ES:BX -> startup info structure (see #2008) or 0000h:0000h
Notes:    called by task switcher
    clients with instance data should hook this call, pass it through to
      the previous handler with unchanged registers using a simulated
      interrupt.  On return, the client should create a startup info
      structure (see #2008), store the returned ES:BX in the "next"
      field, and return the address of the created structure in ES:BX
    all MS-DOS function calls are available from within this call
SeeAlso: AX=1605h,AX=160Bh,AX=4B02h

Format of task switcher startup info structure:
Offset    Size    Description    (Table 2008)
 00h  2 BYTEs    major, minor version of info structure (03h,00h)
 02h    DWORD    pointer to next startup info structure or 0000h:0000h
 06h    DWORD    0000h:0000h (ignored)
 0Ah    DWORD    ignored
 0Eh    DWORD    pointer to instance data records (see #2009)

Format of one instance data record in array:
Offset    Size    Description    (Table 2009)
 00h    DWORD    address of instance data (end of array if 0000h:0000h)
 04h    WORD    size of instance data
--------W-2F4B06-----------------------------
INT 2F - MS Windows - WIN.COM - GET ??? POINTER TO WIN.COM
    AX = 4B06h
Return:    AX = 0000h
    ES:BX -> ??? function in WIN.COM
Note:    the entry point is called with
        AX = 0001h or 0003h
        BX = ???
SeeAlso: AX=4B80h
--------W-2F4B20-----------------------------
INT 2F - MS Windows 3 - WIN.COM - SET PROGRAM TO EXECUTE ON EXIT
    AX = 4B20h
Return: AX = 0000h if successful
        DX:CX -> 256-byte buffer for pathname and commandline (see #2010)
Note:    when the Windows function ExitWindows is called with an exit code of
      44h, WIN.COM executes the program specified in the returned buffer
      and then restarts Windows

Format of WIN.COM buffer:
Offset    Size    Description    (Table 2010)
 00h 128 BYTEs    ASCIZ pathname of program to execute
 80h 128 BYTEs    commandline for program
--------W-2F4B80-----------------------------
INT 2F - MS Windows - WSWAP.EXE - RESET INTERNAL VARIABLES
    AX = 4B80h
Return: nothing
Note:    called by WINOLDAP.MOD
SeeAlso: AX=4B06h
--------p-2F4C-------------------------------
INT 2F U - Advanced Power Management
    AH = 4Ch
    AL = function
        00h version check
        01h suspend system requested
        FFh suspend/resume battery notification
    ???
Return: ???
----------2F4D-------------------------------
INT 2F U - ???
    AH = 4Dh
    ???
Return: ???
Note:    reportedly called by Kana Kanji Converter and MSKK
--------N-2F4E53BL00-------------------------
INT 2F - SilverNET v2+ - INSTALLATION CHECK
    AX = 4E53h ("NS")
    BL = 00h (function "installation check")
    BH = module ID (see #2011)
Return: AX = 0000h if specified module installed
    BX = 4E53h if installed
Program: SilverNET is an SMB-compatible peer-to-peer NOS for DOS or
      Windows systems, by Net-Source, Inc. of Santa Clara, CA.
SeeAlso: AX=4E53h/BL=01h,AX=4E53h/BL=02h,AX=B800h,AX=B809h

(Table 2011)
Values for SilverNET module ID:
 01h    SilverCACHE
 02h    Workstation
 03h    NetBIOS
 04h    Peer
 20h    NS Share
 80h    NetWare help TSR
--------N-2F4E53BL01-------------------------
INT 2F - SilverNET - GET RUNTIME PARAMETER
    AX = 4E53h ("NS")
    BL = 01h (function "get runtime parameter")
    BH = module ID (see #2011)
    CX = parameter index (see #2012,#2014,#2015)
Return: AX = WORD value at specified index (see #2013)
Desc:    retrieve a word of data from the specified SilverNET module

(Table 2012)
Values for SilverNET Peer parameter index (* = read-only):
 00h *    maximum outstanding SMB buffers
 02h *    maximum logged-in nodes
 04h *    number of shareable resources
 06h *    number of characters to print per time slice
 08h *    number of printers that can be shared
 0Ah *    number of nodes logged in
 0Ch *    number of files to allow opened
 0Eh    how fast to despool (/PSLICE)
 10h    audit flag
 24h *    far pointer to resource table (each resource is 96 bytes in length)
 32h *    far pointer to SFT (internal if SilverNET files > CONFIG.SYS files,
    else DOS SFT)
 36h    spool flags (see #2013)

Bitfields for spool flags:
Bit(s)    Description    (Table 2013)
 0    LPT1 needs despooling
 1    LPT2 needs despooling
 2    LPT2 needs despooling
 4    COM1 needs despooling
 5    COM2 needs despooling
 6    COM3 needs despooling

(Table 2014)
Values for NS Share parameter index (* = read-only):
 00h    version number (high byte = minor, low byte = major)
 10h *    segment of first lock record (other records in consecutive paragraphs)
    (if PSP field = 0000h, lock record is free)
 12h *    maximum possible number of lock records
 14h *    starting segment of sharing buffer
    (NS Share's sharing records are identical to DOS SHARE except that
      fields which are normally offsets into SHARE are segment numbers)
 18h *    size of sharing buffer in paragraphs
 1Ah *    total free paragraphs in sharing buffer
 1Ch *    current number of shared files
 1Eh *    current number of locked records

(Table 2015)
Values for Workstation parameter index (* = read-only):
 00h    version number (high byte = minor, low byte = major)
 02h *    size of each network buffer for file operations
 04h *    number of redirector file buffers
 06h *    size of each print cache buffer
 08h *    number of network LPT printers
 0Ch    flush time in ticks (idle time on network printer before flushing)
 0Eh    (16 WORDs) last active time for each printer
 2Eh *    stub segment if program split into two parts
 60h    receive name number for datagram listens
 62h *    18-byte machine name
 74h *    LASTDRIVE (01h = A:, etc.)
 7Ch    row number of message box on screen
 7Eh    message time in clock ticks
 82h *    number of network adapters in use
 84h    station ID broadcast flag (never set on redirectors)
 96h *    NetBIOS names left
 98h *    NCBs left
 9Ah *    sessions left
 A2h *    total number of network printers (LPT+COM)
 A4h *    number of serial network printers
 A8h *    segment containing file cache buffers
 AAh *    segment containing print cache buffers
 ACh *    bytes remaining free in HMA before program loaded
 AEh *    start of free memory in HMA
 B2h *    flag: using HMA
--------N-2F4E53BL02-------------------------
INT 2F - SilverNET - SET RUNTIME PARAMETERS
    AX = 4E53h ("NS")
    BL = 02h (function "set runtime parameters")
    BH = module ID (see #2011)
    CX = parameter index (see #2014,#2015)
    DX = new value for specified parameter
Desc:    set a WORD value in the specified SilverNET module
Note:    not all indexed parameters are writable; modifying a read-only
      parameter can result in system crashes
SeeAlso: AX=4E53h/BL=00h,AX=4E53h/BL=01h
--------N-2F5100-----------------------------
INT 2F U - ODIHLP.EXE - INSTALLATION CHECK
    AX = 5100h
Return: AL = FFh if installed
        BX = 0000h
        DX:SI -> signature string "ODI$HLP$"
Program: ODIHLP is a real-mode helper allowing the Windows for Workgroups 3.11
      protected-mode NDIS3 protocol to work with real-mode ODI drivers
      and LSL.COM
Note:    the returned signature string might be the first field of a structure
SeeAlso: AX=C000h"LSL.COM"
--------k-2F5200-----------------------------
INT 2F - JAM.SYS v1.10+ - "GetVersion" - INSTALLATION CHECK
    AX = 5200h
Return: AH = 80h (successful) if installed
    BX = internal JAM.SYS version number
    CX = size of JAMINFO structure (see #2016,#2017)
    DX = JAM.SYS segment address
Program: JAM.SYS is a main component of the JAM Real-Time Data Compression
      Utilities by George A. Reznik and friends (JAM Software).
SeeAlso: AX=5201h

Format of JAMINFO v1.10 structure:
Offset    Size    Description    (Table 2016)
 00h 25 BYTEs    extended BIOS parameter block (BPB)
 19h 11 BYTEs    ???
 25h    DWORD    total number of sectors in JAM archive file
        (size of compressed data area)
 29h    BYTE    flags (see #2018)
 2Ah 127 BYTEs    full JAM archive file name
 A9h    WORD    the number of fragments in archive file
 ABh 96 BYTEs    archive file fragmentation list -
        array of 16 FRAGMENT structures (see #2019)
10Bh    DWORD    address of the host-drive DPB (Drive Parameter Block)
10Fh    DWORD    number of free sectors in JAM archive file
113h    WORD    device status word (see #2020)
SeeAlso: #2017

Format of JAMINFO v1.20 structure:
Offset    Size    Description    (Table 2017)
 00h 25 BYTEs    extended BIOS parameter block (BPB)
 19h    BYTE    physical driver number
 1Ah    BYTE    reserved
 1Bh    BYTE    extended boot record signature
 1Ch    DWORD    volume serial number
 20h 11 BYTEs    volume label
 2Bh  8 BYTEs    file system ID
 33h    DWORD    total number of sectors in JAM archive file
        (size of compressed data area)
 37h    BYTE    flags (see #2018)
 38h 128 BYTEs    full JAM archive file name
 B8h    WORD    the number of fragments in archive file
 BAh 96 BYTEs    archive file fragmentation list -
        array of 16 FRAGMENT structures (see #2019)
11Ah    DWORD    address of the host-drive DPB (Drive Parameter Block)
11Eh    DWORD    number of free sectors in JAM archive file
122h    WORD    device status word (see #2020)
Note:    the first 33h bytes are copied from the archive file's boot sector
SeeAlso: #2016

Bitfields for JAMINFO flags:
Bit(s)    Description    (Table 2018)
 2-0    reserved
 3    (v1.20+)
 4    enable direct write requests (Int 26h, non-DOS requests, etc.)
 5    read-only mode
 6    no write-behind caching
 7    full undelete-compatible allocation strategy
SeeAlso: #2016,#2017

Format of JAM FRAGMENT structure:
Offset    Size    Description    (Table 2019)
 00h    WORD    starting sector (low word)
 02h    BYTE    starting sector (high byte)
 03h    WORD    size of fragment (low word)
 05h    BYTE    size of fragment (high byte)
SeeAlso: #2016,#2017

(Table 2020)
Values for JAM.SYS status (high byte):
 00h    successful
 01h    drive is not a JAM drive
 02h    drive is already attached
 03h    archive file cluster size value is larger than driver's one
 04h    drive is not attached
 05h    drive is locked
 06h    drive is not locked
 07h    bad physical-level request
 08h    host drive reading/writing error
 09h    bad entries in JAM descriptor table
 0Ah    compressed data integrity error
 0Bh    archive file overflow
 0Ch    bad DOS request
 0Dh    incorrect parameters in JAMINFO structure
Note:    the low byte of the status is the DOS error code for the Host drive
SeeAlso: #1846 at INT 2F/AX=0802h
--------k-2F5201-----------------------------
INT 2F - JAM.SYS v1.10+ - "GetInfo" - GET COMPRESSED DRIVE INFORMATION
    AX = 5201h
    DL = compressed drive number (0-default, 1-A:, etc.)
    DS:BX -> buffer for JAMINFO structure (see #2016,#2017)
Return: AH = status (00h,01h) (see #2020)
SeeAlso: AX=5200h
--------k-2F5202-----------------------------
INT 2F - JAM.SYS v1.10+ - "Attach" - MOUNT COMPRESSED DRIVE
    AX = 5202h
    DL = drive number (0-default, 1-A:, etc.) to attach to the JAM
          archive file
    DS:BX -> pointer to JAMINFO structure (see #2016,#2017), which
          contains parameters of the JAM file to mount, and pointer
          to the host drive DPB (i.e. DPB of the drive on which the
          JAM file is located)
Return: AH = status (00h,02h,03h,08h,09h,0Dh) (see also #2020)
        03h archive file cluster size value is larger than driver's - not
          mounted
        09h bad entries in JAM descriptor table - file mounted read-only
    AL = host drive error code (see #1846 at INT 2F/AX=0802h)
SeeAlso: AX=5203h
--------k-2F5203-----------------------------
INT 2F - JAM.SYS v1.10+ - "Detach" - UNMOUNT COMPRESSED DRIVE
    AX = 5203h
    DL = drive number (0-default, 1-A:, etc.) to detach
Return: AH = status (00h,01h,04h,05h,08h,09h,0Bh,0Dh) (see #2020)
    AL = host drive error code (see #1846 at INT 2F/AX=0802h)
SeeAlso: AX=5202h
--------k-2F5204-----------------------------
INT 2F - JAM.SYS v1.10+ - "Lock" - LOCK COMPRESSED DRIVE
    AX = 5204h
    DL = drive number (0-default, 1-A:, etc.) to lock
Return: AH = status (00h,01h,04h,05h,08h,09h,0Bh,0Dh) (see #2020)
    AL = host drive error code (see #1846 at INT 2F/AX=0802h)
SeeAlso: AX=5205h, AX=5206h, AX=5207h
--------k-2F5205-----------------------------
INT 2F - JAM.SYS v1.10+ - "UnLock" - UNLOCK COMPRESSED DRIVE
    AX = 5205h
    DL = drive number (0-default, 1-A:, etc.) to unlock
Return: AH = status (00h,01h,04h,06h,08h,09h,0Dh) (see #2020)
    AL = host drive error code (see #1846 at INT 2F/AX=0802h)
SeeAlso: AX=5204h, AX=5206h, AX=5207h
Note:    Lock and UnLock functions were added to the JAM API to prevent
      asynchronous physical-level access (see AX=5206h,AX=5207h) to
      compressed data on JAM drives. In other words, two or more programs
      which use JAM API (say, JMAX optimizer and JCHKDSK - disk checker)
      cannot be run on the same JAM drive simultaneously.
--------k-2F5206-----------------------------
INT 2F - JAM.SYS v1.10+ - "Read" - PHYSICAL READ DATA FROM JAM ARCHIVE
    AX = 5206h
    DL = drive number (0-default, 1-A:, etc.)
    DS:BX -> disk transfer packet (see #2021)
Return: AH = status (00h,01h,04h,06h,07h,08h,0Dh) (see #2020)
    AL = host drive error code (see #1846 at INT 2F/AX=0802h)
Program: JAM.SYS is a main component of the JAM Real-Time Data Compression
      Utilities by George A. Reznik and friends (JAM Software).
SeeAlso: AX=5207h

Format of disk transfer packet:
Offset    Size    Description    (Table 2021)
 00h    DWORD    sector number
 04h    WORD    number of sectors to read(write)
 06h    DWORD    transfer address
--------k-2F5207-----------------------------
INT 2F - JAM.SYS v1.10+ - "Write" - PHYSICAL WRITE DATA TO JAM ARCHIVE
    AX = 5207h
    DL = drive number (0-default, 1-A:, etc.)
    DS:BX -> disk transfer packet (see #2021)
Return: AH = status (00h,01h,04h,06h,07h,08h,0Dh) (see #2020)
    AL = host drive error code (see #1846 at INT 2F/AX=0802h)
SeeAlso: AX=5206h
--------p-2F53-------------------------------
INT 2F U - POWER.EXE - APM event broadcasting???
    AH = 53h
    AL = event???
        05h CPU idle
        0Bh PM event broadcast API
Return: ???
Note:    called by MS Windows 3.1 POWER.DRV; hooked by MS Mouse driver v8.20+
      and PC-Cache v8.0
SeeAlso: AX=530Bh,AH=54h,INT 33/AX=002Fh
--------p-2F530B-----------------------------
INT 2F U - ??? (MOUSEPWR.COM, others) - ???
    AX = 530Bh
    BX = subfunction
        0003h ???
        0004h ???
    ???
Return: ???
Note:    it appears that subfunction 0003h reads or restores the current mouse
      settings (the MS Mouse driver hooks AX=530Bh), and 0004h might be
      the converse
--------p-2F5400-----------------------------
INT 2F U - POWER.EXE - INSTALLATION CHECK
    AX = 5400h
Return: AX = POWER.EXE version (AH = major, AL = minor) if installed
    BX = 504Dh ("PM")
    CF clear
Note:    called by MS Windows 3.1 POWER.DRV
SeeAlso: AH=53h,AX=5401h,AX=5402h,AX=5481h,AX=5482h
--------p-2F5401-----------------------------
INT 2F U - POWER.EXE - GET/SET POWER STATUS
    AX = 5401h
    BH = function
        00h get status
        Return: BL = current power management status (see #2022)
        01h set status
        BL = new power managment status (see #2022)
Return: AX = function status (see #2023)
Note:    called by MS Windows 3.1 POWER.DRV
SeeAlso: AH=53h,AX=5400h,AX=5402h,AX=5403h

Bitfields for power management status:
Bit(s)    Description    (Table 2022)
 0    POWER.EXE power management enabled
 1    APM firmware power management enabled
 2-7    reserved (0)
Notes:    bit 1 is ignored if there is no APM firmware
    bits 1-0: 00 = POWER OFF, 10 = POWER STD, 11 = POWER ADV

(Table 2023)
Values for POWER.EXE function status:
 0000h    successful
 0002h    "ERROR_PM_ALREADY_CONNECTED"
 0003h    "ERROR_PM_NOT_CONNECTED"
 0087h    "ERROR_PM_INVALID_PARAMETER"
--------p-2F5402-----------------------------
INT 2F U - POWER.EXE - GET/SET IDLE DETECTION STRATEGY
    AX = 5402h
    BH = subfunction
        00h get
        other set
        BL = detection strategy (00h-0Fh or FFh)
Return: BX = current/new detection strategy
SeeAlso: AH=53h,AX=5400h,AX=5401h,AX=5481h,AX=5482h
--------p-2F5403-----------------------------
INT 2F U - POWER.EXE - GET/SET ADVANCED POWER MANAGEMENT SETTING
    AX = 5403h
    BX = new power management setting or 0000h to get current setting
Return: AX = status
        0000h successful
        BX = power management setting (see #2024)
        other error code
SeeAlso: AX=5401h,AX=5480h

(Table 2024)
Values for power management setting:
 0001h-0005h "min"
 0006h         "reg"
 0007h-0008h "max"
--------t-2F5453-----------------------------
INT 2F - TesSeRact RAM-RESIDENT PROGRAM INTERFACE
    AX = 5453h
    BX = subfunction
        00h installation check
        CX = 0000h
        DS:SI -> 8-char blank-padded name (see #2025)
        Return: AX = FFFFh installed
                CX = ID number of already-installed copy
            AX = anything else, not installed
                CX = ID number for TSR when installed
        01h get user parameters
        CX = TSR ID number
        Return: AX = status
                0000h successful
                ES:BX -> user parameter block (see #2026)
                nonzero failed
        02h check if hotkey in use
        CL = scan code of hot key (see #0005)
        Return: AX = FFFFh hot key conflicts with another TSR
                 otherwise safe to use the hotkey
        03h replace default critical error handler
        CX = TSR ID number
        DS:SI -> new routine for INT 24h
        Return: AX = nonzero, unable to install new handler
        04h get internal data area
        CX = TSR ID number
        Return: AX = status
                0000h successful
                ES:BX -> TSR's internal data area (see #2027)
                nonzero, TSR not found
        05h set multiple hot keys
        CX = TSR ID number
        DL = number of additional hot keys to allocate
        DS:SI -> table of hot keys
            BYTE  hotkey scan code (see #0005)
            BYTE  hotkey shift state
            BYTE  flag value to pass to TSR (nonzero)
        Return: AX = nonzero, unable to install hot keys
        06h - 0Fh reserved
        10h enable TSR
        CX = TSR ID number
        Return: AX = nonzero, unable to enable
        11h disable TSR
        CX = TSR ID number
        Return: AX = nonzero, unable to disable
        12h unload TSR
        CX = TSR ID number
        Return: AX = nonzero, invalid TSR number
        Note: if any interrupts used by TSR have been grabbed by
            another TSR, the TesSeRact routines will wait until
            it is safe to remove the indicated TSR from memory
        13h restart TSR
        CX = TSR ID number of TSR which was unloaded but is still in
             memory
        Return: AX = nonzero, unable to restart TSR
        14h get status word
        CX = TSR ID number
        Return: AX = FFFFh invalid ID number
               = other, successful
                BX = bit flags
        15h set status word
        CX = TSR ID number
        DX = new bit flags
        Return: AX = nonzero, unable to set status word
        16h get INDOS state at popup
        CX = TSR ID number
        Return: AX = 0000h successful
                BX = value of INDOS flag
        17h - 1Fh reserved
        20h call user procedure
        CX = TSR ID number
        ES:DI -> user-defined data
        Return: AX = 0000h successful
        21h stuff keystrokes into keyboard buffer
        CX = TSR ID number
        DL = speed
            00h stuff keystrokes only when buffer is empty
            01h stuff up to four keystrokes per clock tick
            02h stuff up to 15 keystrokes per clock tick
        DH = scan code flag
            if zero, buffer contains alternating ASCII and scan codes
            if nonzero, buffer contains only ASCII codes
        SI = number of keystrokes
        ES:DI -> buffer to stuff
        Return: AX = 0000h success
                 F0F0h user aborted with ^C or ^Break
                 other unable to stuff keystrokes
        22h (v1.10) trigger popup
        CX = TSR ID number
        Return: AX = 0000h success, TSR will either pop up or beep to
                   indicate that it is unable to pop up
                 nonzero invalid ID number
        23h (v1.10) invoke TSR's background function
        CX = TSR ID number
        Return: AX = 0000h success
                 FFFFh not safe to call background function
                 nonzero invalid ID number
        24h - 2Fh reserved
Notes:    Borland's THELP.COM popup help system for Turbo Pascal and Turbo C
      (versions 1.x and 2.x only) fully supports the TesSeRact API, as
      do the SWAP?? programs by Innovative Data Concepts.
    AVATAR.SYS supports functions 00h and 01h (only the first three fields
      of the user parameter block) using the name "AVATAR  "
SeeAlso: AX=CAFEh,INT 16/AX=55FFh,INT 2D"AMIS"
Index:    installation check;TesSeRact TSR interface|uninstall;TesSeRact

(Table 2025)
Values for TesSeRact names:
 "AVATAR  "    AVATAR.SYS
 "QeditTSR"    TSR version of SemWare's Qedit editor
 "SCRNBLNK"    Trusted Access screen blanker

Format of TesSeRact User Parameter Block:
Offset    Size    Description    (Table 2026)
 00h  8 BYTEs    blank-padded TSR name
 08h    WORD    TSR ID number
 0Ah    DWORD    bitmap of supported functions
 0Eh    BYTE    scan code of primary hotkey (see #0005)
        00h = pop up when shift states match
        FFh = no popup (if shift state also FFh)
 0Fh    BYTE    shift state of primary hotkey
        FFh = no popup (if scan code also FFh)
 10h    BYTE    number of secondary hotkeys
 11h    DWORD    pointer to extra hotkeys set by func 05h
 15h    WORD    current TSR status flags
 17h    WORD    PSP segment of TSR
 19h    DWORD    DTA for TSR
 1Dh    WORD    default DS for TSR
 1Fh    DWORD    stack at popup
 23h    DWORD    stack at background invocation
Index:    hotkeys;TesSeRact TSR interface

Format of TSR internal data area:
Offset    Size    Description    (Table 2027)
 00h    BYTE    revision level of TesSeRact library
 01h    BYTE    type of popup in effect
 02h    BYTE    INT 08 occurred since last invocation
 03h    BYTE    INT 13 occurred since last invocation
 04h    BYTE    active interrupts
 05h    BYTE    active soft interrupts
 06h    BYTE    DOS major version
 07h    BYTE    how long to wait before popping up
 08h    DWORD    pointer to INDOS flag
 0CH    DWORD    pointer to DOS critical error flag
 10h    WORD    PSP segment of interrupted program
 12h    WORD    PSP segment of prog interrupted by INT 28
 14h    DWORD    DTA of interrupted program
 18h    DWORD    DTA of program interrupted by INT 28
 1Ch    WORD    SS of interrupted program
 1Eh    WORD    SP of interrupted program
 20h    WORD    SS of program interrupted by INT 28
 22h    WORD    SP of program interrupted by INT 28
 24h    DWORD    INT 24 of interrupted program
 28h  3 WORDs    DOS 3.0+ extended error info
 2Eh    BYTE    old BREAK setting
 2Fh    BYTE    old VERIFY setting
 30h    BYTE    were running MS WORD 4.0 before popup
 31h    BYTE    MS WORD 4.0 special popup flag
 32h    BYTE    enhanced keyboard call in use
 33h    BYTE    delay for MS WORD 4.0
11 times (for INTs 08h,09h,13h,16h,1Ch,21h,28h,2Fh,1Bh,23h, and 24h):
    DWORD    old interrupt vector
    BYTE    interrupt number
    WORD    offset in TesSeRact code segment of new interrupt handler
--------p-2F5480-----------------------------
INT 2F U - POWER.EXE - GET/SET ???
    AX = 5480h
    BX = direction
        0000h get
        other set
    CX = size of buffer (at least 0010h)
    DS:SI -> buffer
Return: AX = status
        0000h successful
        other error code
SeeAlso: AX=5400h,AX=5481h,AX=548Fh
--------p-2F5481-----------------------------
INT 2F U - POWER.EXE - GET STATISTICS
    AX = 5481h
    BX = which statistics
        0000h idle detection
        0001h APM statistics
    CX = length of buffer in bytes
    DS:SI -> buffer for statistics (see #2028,#2029)
Return: AX = status
        0000h successful
        0071h "ERROR_PM_BUFFER_TOO_SMALL"
        0087h "ERROR_PM_INVALID_PARAMETER"
SeeAlso: AH=53h,AX=5400h,AX=5480h,AX=5402h,AX=5482h

Format of POWER.EXE idle detection statistics:
Offset    Size    Description    (Table 2028)
 00h    DWORD    "CPU_ON_TIME" total time CPU is active with POWER.EXE idle
          detection enabled, in timer ticks
 04h    DWORD    "CPU_IDLE_TIME" timer ticks during which CPU was idle
        (divide by previous to get idle    rate)
 08h    DWORD    total idle calls
 0Ch    DWORD    "TOTAL_APP_IDLE" total INT 2Fh idle calls
 10h    DWORD    "TOTAL_DOS_YIELD" total INT 28h idle calls
 14h    DWORD    "TOTAL_KEY_IDLE" total INT 16h idle calls
 18h    DWORD    "TOTAL_DOS_IDLE" total INT 2Ah idle calls

Format of APM statistics:
Offset    Size    Description    (Table 2029)
 00h    DWORD    "RESUME_COUNT" total number of resumes since last APM_ENABLE
--------p-2F5482-----------------------------
INT 2F U - POWER.EXE - GET/SET APM POLLING FREQUENCY
    AX = 5482h
    BX = new polling frequency or 0000h to get current frequency
Return: AX = 0000h (successful)
    BX = current frequency if BX=0000h on entry
SeeAlso: AH=53h,AX=5400h,AX=5401h,AX=5480h,AX=5481h,AX=548Fh
--------p-2F548F-----------------------------
INT 2F U - POWER.EXE - GET/SET ???
    AX = 548Fh
    BX = ??? or 0000h to get current ???
Return: AX = 0000h (successful)
    BX = current ???
    CX = ???
SeeAlso: AX=5400h,AX=5480h,AX=5482h
--------l-2F5500-----------------------------
INT 2F U - DOS 5+ - COMMAND.COM INTERFACE
    AX = 5500h
Return: AX = 0000h if an instance of COMMAND.COM is already running
    DS:SI -> entry point table
Notes:    used to access the shareable portion of COMMAND.COM, which may have
      been moved into the HMA; only the primary COMMAND.COM retains this
      portion
    procedures called from a dispatcher in COMMAND's resident portion;
      most assume that the segment address of the resident portion is on
      the stack and are thus not of general use
SeeAlso: AX=5501h
--------l-2F5501-----------------------------
INT 2F U - DOS 5+ - ROM COMMAND.COM INTERFACE
    AX = 5501h
Return: ???
Note:    used to determine whether the caller is the first instance of ROM
      COMMAND.COM
SeeAlso: AX=5500h
--------R-2F5600-----------------------------
INT 2F - INTERLNK - INSTALLATION CHECK
    AX = 5600h
    DX = magic value FFFFh
    BL = instance number (00h = any, 01h = first loaded, etc.)
Return: AL = FFh if installed
        BL = instance number
        CX = ??? (apparently always 0001h)
        DX = resident CS of driver, DX:0000h -> header (see #2030)
SeeAlso: AX=5601h,AX=5602h,INT 60/AX=0000h

Format of Interlnk device driver header:
Offset    Size    Description    (Table 2030)
 00h    DWORD    pointer to next driver, offset=FFFFh if last driver
 04h    WORD    device attributes (see #0934,#0935)
 06h    WORD    device strategy entry point
 08h    WORD    device interrupt entry point
 0Ah  8 BYTEs    character device name "NUL2    "
 12h 165 BYTEs    ???
 B7h 67 BYTEs    fully qualified Interlnk filename
 FAh  6 BYTEs    ???
100h    DWORD    pointer back to Interlnk filename at offset B7h
104h  8 BYTEs    ???
10Ch    BYTE    total number of redirected drives
10Dh    BYTE    first local drive number (0=A:)
10Eh    BYTE    printer redirection (0=no, 1=yes)
10Fh    BYTE    ???
110h  3    BYTEs    LPT1...3 status (0FFh=invalid)
113h 26 BYTEs    remote drive number (0=A:, 0FEh=unused) (see note below)
12Dh 26 BYTEs    always 0FEh ???
147h 26 BYTEs    always 0FFh ???
Note:    to obtain the remote drive number, subtract the value at offset 10Ch
      from the local drive number before indexing into the table at 113h
      (example: if local drives F, G, H are remote drives C, F, E then
      the first three bytes at offset 113h are 02h, 05h, 04h)
    for each instance of Interlnk, an extra device driver is loaded, but
      all have the same device name NUL2
SeeAlso: #0933 at INT 21/AH=52h
--------R-2F5601-----------------------------
INT 2F - INTERLNK - CHECK IF REDIRECTED DRIVE
    AX = 5601h
    DX = magic value FFFFh
    BH = drive number (0=A:)
    BL = 00h
Return: (as for AL=00h if redirected drive)
SeeAlso: AX=5600h
--------R-2F5602-----------------------------
INT 2F - INTERLNK - GET ???
    AX = 5602h
    DX = magic value FFFFh
Return: CX = ???
SeeAlso: AX=5600h
----------2F57-------------------------------
INT 2F U - ???
    AH = 57h
    ???
Return: ???
Note:    reportedly used by Iomega Corp.
--------c-2F5758BX4858-----------------------
INT 2F U - Helix Multimedia Cloaking - CACHECLK - INSTALLATION CHECK
    AX = 5758h
    BX = 4858h ('HX')
    DX = 4443h ('DC')
    CX <> 5758h
Return: BX = 6878h if installed
    DX = 6463h if installed
       CX = version (CH=major,CL=minor)
Program: CACHECLK is a 'Cloaked' disk cache by Helix Software
Note:    returns with registers unchanged if CX=5758h on entry
SeeAlso: INT 16/AX=5758h/BX=4858h,INT 2F/AX=4310h"Cloaking"
--------X-2F5D00-----------------------------
INT 2F U - PCMCIA - AWARD PCDISK - GET INFO FROM DRIVER ???
    AX = 5D00h
Return: ES:BX -> ???
Note:    supported by Ventura Micro / Award PCDISK.EXE v1.02c PCMCIA/ATA driver
SeeAlso: AX=5D01h,INT 21/AX=440Dh
--------X-2F5D01-----------------------------
INT 2F U - PCMCIA - AWARD PCDISK - PUT INFO INTO DRIVER ???
    AX = 5D01h
    ES:BX -> ???
Return: nothing
Note:    supported by Ventura Micro / Award PCDISK.EXE v1.02c PCMCIA/ATA driver
SeeAlso: AX=5D00h,INT 21/AX=440Dh
--------s-2F60FFDL00-------------------------
INT 2F U - IPLAY v1.00b - INSTALLATION CHECK
    AX = 60FFh
    DL = 00h (function number)
    BX = 5344h ('SD')
    CX = 4D50h ('MP')
Return: AX = 4F4Bh ('OK') if installed
Program: IPLAY is the Inertia Player by Prime and Excalibur for .MODules
      (digitized music files)
Note:    in version 1.00b, any value for DL except 01h invokes this function
SeeAlso: AX=60FFh/DL=01h
--------s-2F60FFDL01-------------------------
INT 2F U - IPLAY v1.00b - GET DATA SEGMENT
    AX = 60FFh
    DL = 01h (function number)
    BX = 5344h ('SD')
    CX = 4D50h ('MP')
Return: AX = data segment
Program: IPLAY is the Inertia Player by Prime and Excalibur for .MODules
      (digitized music files)
SeeAlso: AX=60FFh/DL=00h
--------v-2F6282-----------------------------
INT 2F U - PC Tools v7.0+ VDEFEND, VSAFE, VWATCH, DATAMON - SET ??? ADDRESS
    AX = 6282h
    CX:DX -> ??? or 0000h:0000h
    DI = segment of ??? record (see #2031) or 0000h/FFFFh to ignore
Return: BX = 0062h
Note:    if CX:DX = 0000h:0000h on entry, the ??? address is not changed
      (DATAMON only)
SeeAlso: INT 13/AH=FAh"VSAFE",INT 21/AH=FAh"VDEFEND"

Format of VSAFE/VWATCH record:
Offset    Size    Description    (Table 2031)
 00h    DWORD    ???
 04h    WORD    offset of ??? in record's segment
        VSAFE 2.0 sets byte at +01h to 56h or 58h
        VWATCH 2.1 sets byte at +02h to 56h or 58h
 06h  2 BYTEs    ???
 08h    BYTE    ??? (01h/other)
--------v-2F6284BX0000-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT    - INSTALLATION CHECK
    AX = 6284h
    BX = 0000h
    CX = 0000h
Return: AX = segment of resident code
    BX = 5555h
    CX = 5555h
Note:    also supported by DOS 6 UNDELETE which is licensed from PC Tools
SeeAlso: AX=6284h/BX=0001h,INT 16/AX=FFA3h
--------v-2F6284BX0001-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - GET ???
    AX = 6284h
    BX = 0001h
    CX = 0001h
Return: AX:BX -> ??? data (see #2032)
    CX = BX
SeeAlso: AX=6284h/BX=0000h

Format of DPROTECT data for v9.0:
Offset    Size    Description    (Table 2032)
 00h  5 BYTEs    ???
 05h    WORD    resident code segment (may be segment of DWORD at +03h)
 07h    DWORD    -> FAR function to sound alert tone
    ???
--------v-2F6284BX0002-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - GET OPTIONS
    AX = 6284h
    BX = 0002h
    CX = 0002h
Return: AX = options (see #2033)
    BX = ??? (0000h for v9)
    CX = AX
    DX = BX
Note:    also supported by DOS 6 UNDELETE which is licensed from PC Tools
SeeAlso: AX=6284h/BX=0000h,AX=6284h/BX=0003h

Bitfields for DATAMON/DPROTECT options:
Bit(s)    Description    (Table 2033)
 1    ???
 12    disabled
 13    using Delete Sentry
 14    using Delete Tracker
--------v-2F6284BX0003-----------------------
INT 2F U - PC Tools v7-8 DATAMON, v9+ DPROTECT - SET OPTION??? FLAGS
    AX = 6284h
    BX = 0003h
    CX = flags (see #2034)
    DX = flags
        bit 15: ???
Note:    v9 DPROTECT only checks bit 12 of CX, and ignores DX entirely
SeeAlso: AX=6284h/BX=0002h

Bitfields for DATAMON/DPROTECT CX flags:
Bit(s)    Description    (Table 2034)
 3    ???
 5    ???
 10    ???
 12    disable DATAMON/DPROTECT
--------v-2F6284BX0004-----------------------
INT 2F U - PC Tools v8 DATAMON, v9+ DPROTECT - ???
    AX = 6284h
    BX = 0004h
    CX = 0004h
Return: AX = 5555h
    BX = ??? (0800h)
    CX = ??? (FCCCh for v8, FCCBh for v9)
--------V-2F6400-----------------------------
INT 2F - SCRNSAV2.COM - INSTALLATION CHECK
    AX = 6400h
Return: AL = installation state
        00h not installed
        FFh installed
Program: SCRNSAV2.COM is a screen saver for PS/2s with VGA by Alan Ballard
SeeAlso: INT 10/AX=5555h,INT 14/AX=AA01h
Index:    screen saver;SCRNSAV2
--------N-2F7000-----------------------------
INT 2F - License Service API - INSTALLATION CHECK
    AX = 7000h
    CX = license server index (0000h to 001Fh)
Return: AL = status
        00h not installed
        FFh installed
Notes:    The License Service API is being maintained by Microsoft but is being
      supported by a large number of companies including Apple, Banyan,
      DEC, HP, Lotus, Microsoft, Novell, Software Publishers Association,
      and Wordperfect (not a complete list!)
    Each license service provider must search for the next free index
      slot to use
SeeAlso: AX=7001h,AX=7003h,AX=7004h,AX=7005h
--------N-2F7001-----------------------------
INT 2F - License Service API - REQUEST LICENSE
    AX = 7001h
    CX = license server index (0000h to 001Fh)
    DS:DX -> SLSREQUEST structure (see #2035)
Return: AX = status
        0000h success
        else  provider error code
    ES:BX = provider specific handle for the license context
SeeAlso: AX=7002h,AX=7004h,AX=7005h

Format of License Service SLSREQUEST structure:
Offset    Size    Description    (Table 2035)
 00h    DWORD    (ret) status code
 04h    DWORD    (ret) handle identifying context
 08h    DWORD    (call) address of Publisher string
 0Ch    DWORD    (call) address of Product string
 10h    DWORD    (call) address of Version string
 14h    DWORD    units required
 18h    DWORD    address of comment string
 1Ch    DWORD    address of SLSCHALLENGE structure (see #2036)

Format of License Service SLSCHALLENGE structure:
Offset    Size    Description    (Table 2036)
 00h    DWORD    algorithm (currently always 1)
 04h    DWORD    secret to be challenged (1-255)
 08h    DWORD    size of challenge in bytes (1-255)
 0Ch  N BYTEs    challenge data
--------N-2F7002-----------------------------
INT 2F - License Service API - RELEASE LICENSE
    AX = 7002h
    CX = license server index (0000h to 001Fh)
    DS:DX -> SLSRELEASE structure (see #2037)
    ES:BX = provider specific handle for the license context
Return: AL = status
        00h not installed
        FFh installed
SeeAlso: AX=7001h,AX=7005h

Format of License Service SLSRELEASE structure:
Offset    Size    Description    (Table 2037)
 00h    DWORD    handle indentifying license context
 04h    DWORD    total units consumed
 08h    DWORD    address of comment string
--------N-2F7003-----------------------------
INT 2F - License Service API - UPDATE
    AX = 7003h
    CX = license server index (0000h to 001Fh)
    DS:DX -> SLSUPDATE structure (see #2038)
    ES:BX = provider specific handle for the license context
Return: AL = status
        00h not installed
        FFh installed
SeeAlso: AX=7004h,AX=7005h

Format of License Service SLSUPDATE structure:
Offset    Size    Description    (Table 2038)
 00h    DWORD    (ret) status code
 04h    DWORD    (call) handle identifying license context
 08h    DWORD    (call) total units consumed
 0Ch    DWORD    additional units required
 10h    DWORD    address of comment string
 14h    DWORD    address of SLSCHALLENGE structure (see #2036)
--------N-2F7004-----------------------------
INT 2F - License Service API - GET ERROR
    AX = 7004h
    CX = license server index (0000h to 001Fh)
    DS:DX -> SLSGETERROR structure (see #2039)
    ES:BX = provider specific handle for the license context
Return: AL = status
        00h not installed
        FFh installed
SeeAlso: AX=7000h,AX=7001h

Format of License Service SLSGETERROR structure:
Offset    Size    Description    (Table 2039)
 00h    DWORD    (ret) status code
 04h    DWORD    handle identifying license context
 08h    DWORD    error code
 0Ch    DWORD    buffer size in bytes
 10h  N BYTEs    data buffer
--------N-2F7005-----------------------------
INT 2F - License Service API - QUERY LICENSE
    AX = 7005h
    CX = license server index (0000h to 001Fh)
    DS:DX -> SLSQUERY structure (see #2040)
    ES:BX = provider specific handle for the license context
Return: AL = status
        00h not installed
        FFh installed
SeeAlso: AX=7001h,AX=7002h

Format of License Service SLSQUERY structure:
Offset    Size    Description    (Table 2040)
 00h    DWORD    (ret) status code
 04h    DWORD    handle identifying license context
 08h    DWORD    information index
 0Ch    DWORD    buffer size in bytes
 10h  N BYTEs    data buffer
--------K-2F7041BX4B70-----------------------
INT 2F U - HP 200LX - KEY200 - INSTALLATION CHECK
    AX = 7041h
    BX = 4B70h
Return: BX = 7965h if keyboard remapper KEY200.COM installed
--------d-2F7200-----------------------------
INT 2F - SRDISK v1.30+ - INSTALLATION CHECK
    AX = 7200h
Return: AL = FFh if installed
        ES = segment of device driver header (see #2041)
Program: SRDISK is a freeware resizeable RAMdisk by Marko Kohtala
SeeAlso: AX=7201h

Format of SRDISK device driver header:
Offset    Size    Description    (Table 2041)
 00h 10 BYTEs    same as standard device driver header
          (see #0933 at INT 21/AH=52h)
 0Ah    BYTE    number of subunits (drives) supported by driver
 0Bh  3 BYTEs    signature "SRD"
 0Eh  4 BYTEs    memory type string ("XMS "/"EMS ")
 12h  4 BYTEs    ASCII driver version string "N.NN"
 16h    BYTE    00h
 17h    BYTE    configuration format version (currently 00h or 01h)
 18h    WORD    offset of drive configuration data
--------d-2F7201-----------------------------
INT 2F - SRDISK v2.02 - GET CODE/DATA SEGMENT
    AX = 7201h
Return: AL = FFh if installed
        ES = segment of device driver header
Program: SRDISK is a freeware resizeable RAMdisk by Marko Kohtala
SeeAlso: AX=7200h
--------N-2F7A00-----------------------------
INT 2F - Novell NetWare - LOW-LEVEL API (IPX) INSTALLATION CHECK
    AX = 7A00h
Return: AL = status
        00h not installed
        FFh installed
        ES:DI -> FAR entry point for routines accessed exclusively
              through INT 7A in NetWare versions through 2.0a.
              Call with same values as INT 7A
        ES:BX -> two bytes containing IPX major/minor version
            (IPXODI v2.12; BX unchanged by older IPX drivers)
SeeAlso: AX=7AFFh/BX=0000h,AX=D800h,INT 64"Novell",INT 7A"Novell"
--------N-2F7A10-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - GET TBMI STATUS
    AX = 7A10h
Return: DH = major TBMI version number
    DL = minor TBMI version number (01h for v1.1)
    CX = segment address of TBMI resident part
    BX = status word of TBMI (see #2042)
Note:    TBMI is the Task-Switched Buffer Manager Interface
SeeAlso: AX=7A11h,AX=7A12h,AX=7A13h,AX=7A14h

Bitfields for NetWare TBMI status word:
Bit(s)    Description    (Table 2042)
 0    INT2F intercepted by TBMI
 1    INT7A intercepted by TBMI
 2    INT64 intercepted by TBMI
 3-14    reserved or unused ???
 15    outstanding task ID was detected
--------N-2F7A11-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - GET INT2F HANDLERS
    AX = 7A11h
Return: ES:BX -> old INT 2F handler
    DS:DX -> TBMI INT 2F handler
SeeAlso: AX=7A10h,AX=7A12h,AX=7A13h,AX=7A1Ah
--------N-2F7A12-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - GET INT64 HANDLERS
    AX = 7A12h
Return: ES:BX -> old INT 64 handler
    DS:DX -> TBMI INT 64 handler
SeeAlso: AX=7A10h,AX=7A11h,AX=7A13h
--------N-2F7A13-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - GET INT7A HANDLERS
    AX = 7A13h
Return: ES:BX -> old INT 7A handler
    DS:DX -> TBMI INT 7A handler
SeeAlso: AX=7A10h,AX=7A11h,AX=7A12h
--------N-2F7A14-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - GET STATISTICS
    AX = 7A14h
    CX = statistic to retrieve
        0000h available diagnostic functions???
        Return: CX = maximum available function??? (000Ch for v2.0)
        0001h buffers in use
        Return: CX = TBMI buffers currently in use
        0002h maximum buffers used
        Return: CX = maximum number of buffers ever in use
        0003h unavailable buffers
        Return: CX = count of unavailable TBMI buffers
        0004h old interrupt usage
        Return: CX = TBMI accesses to intercepted old vectors INT 2F,
                  INT 64, and INT 7A
        0005h far call usage
        Return: CX = TBMI accesses to IPX/SPX far call handler (not
                  including internal accesses)
        0006h task buffering
        Return: CX = TBMI task buffering status (enabled/disabled or
                  disable/enable switch count???)
        0007h current task ID
        Return: CX = TBMI current task ID number (0000h if ???)
        0008h outstanding ID count
        Return: CX = number of outstanding TBMI IDs
        0009h configured ECBs
        Return: CX = number of TBMI Event Control Blocks configured
        000Ah configured data ECBs
        Return: CX = number of TBMI data ECBs configured
        000Bh configured sockets
        Return: CX = number of TBMI sockets configured (from NETCFG)
        000Ch current sockets
        Return: CX = number of TBMI sockets currently in use
Return: BX = maximum supported subfunction (000Ch)
SeeAlso: AX=7A10h
--------N-2F7A15-----------------------------
INT 2F OU - Novell NetWare - TBMI v1.1 only - RESET ???
    AX = 7A15h
Return: BX = new value of ???
Desc:    set ??? to its default value
Note:    this call is a NOP under TBMI v2.0 (TBMI2)
SeeAlso: AX=7A17h
--------N-2F7A16-----------------------------
INT 2F OU - Novell NetWare - TBMI v1.1 only - ???
    AX = 7A16h
    CX = ???
    ???
Return: ???
Note:    this call is a NOP under TBMI v2.0 (TBMI2)
--------N-2F7A17-----------------------------
INT 2F OU - Novell NetWare - TBMI v1.1 only - ???
    AX = 7A17h
    ???
Return: BX = old value of ???
    CX = new value of ???
Note:    this call is a NOP under TBMI v2.0 (TBMI2)
SeeAlso: AX=7A15h
--------N-2F7A18-----------------------------
INT 2F U - Novell NetWare - TASKID v1.0 - INSTALLATION CHECK
    AX = 7A18h
Return: AL = FFh if installed
        BX = configuration flags (see #2043)
        CX = resident code segment
SeeAlso: AX=7A10h

Bitfields for NetWare TASKID configuration flags:
Bit(s)    Description    (Table 2043)
 0    INT 2F hooked
 3    INT 08 hooked
 other    unused
--------N-2F7A19-----------------------------
INT 2F U - Novell NetWare - TASKID v1.0 - GET INT 08 HANDLERS
    AX = 7A19h
Return: AL = FFh
    DS:DX -> TASKID INT 08 handler
    ES:BX -> original INT 08 handler
--------N-2F7A1A-----------------------------
INT 2F U - Novell NetWare - TASKID v1.0 - GET INT 2F HANDLERS
    AX = 7A1Ah
Return: AL = FFh
    DX:DX -> TASKID INT 2F handler
    ES:BX -> original INT 2F handler
SeeAlso: AX=7A11h,AX=7A19h
--------N-2F7A1B-----------------------------
INT 2F U - Novell NetWare - TASKID v1.0 - GET DIAGNOSTICS INFORMATION
    AX = 7A1Bh
    CX = desired information
        0000h supported functions
        0001h TASKID ID number
        Return: CX = ID number
        0002h set-ID count
        Return: CX = ID set count
Return: AL = FFh
    BX = highest supported subfunction number (0002h)
SeeAlso: AX=7A14h,AX=7A18h
--------N-2F7A1C-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - ???
    AX = 7A1Ch
    BP = ???
    CX:DX = ???
Return: AX = 70FFh
--------N-2F7A1D-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - ???
    AX = 7A1Dh
    ???
Return: ES = ???
    ???
    SI destroyed
--------N-2F7A1E-----------------------------
INT 2F U - Novell NetWare - TBMI v1.1+ - ???
    AX = 7A1Eh
    ES:SI -> ???
    ???
Return: ???
--------N-2F7A20BX0000-----------------------
INT 2F - Novell NetWare - Adv NetWare 4.0 DOS Requester - GET VLM CALL ADDRESS
    AX = 7A20h
    BX = 0000h
Return: AX = 0000h on success (installed)
        ES:BX -> far call address for DOS Requester (see #2044)
Notes:    the DOS Requester replaces the NetWare Shell (ANETx, NETx) on
      NetWare LAN's as of the release of Advanced NetWare 4.0 (1993).  It
      is backward compatible with NetWare 2.1x through 3.11 servers as
      well.     Note that there was a NetWare 4.0 in the early 1980's, which
      can cause confusion.
    this call is used as the installation check by VLM.EXE, which is the
      loader for all the modules of the DOS Requester
    .VLMs are standard old .EXE format executables whose normal entry point
      merely terminates to prevent loading from the command line.  The
      real entry point is found by looking at the VLM header at the
      beginning of the load image (see #2047)
Index:    installation check;NetWare 4.0 DOS Requester

(Table 2044)
Call DOS Requester entry point with:
    STACK:    WORD    destination function
        WORD    destination VLM ID (see #2046)
        WORD    source VLM ID (0000h = application program)
    registers as appropriate for function
Return: AX = status code (0000h,8811h,8846h,8848h,8853h) (see #2045)
    other registers as appropriate for function
    STACK popped
    BP destroyed

(Table 2045)
Values for VLM status code:
 0000h    successful
 88xxh    error generated by requester
 8801h    invalid or non-attached connection handle
 8803h    cannot add CDS
 8804h    bad path
 8805h    error sending or receiving NCP packets
 8811h    nonexistent function called
 8836h    attempted function with invalid parameter
 8846h    ???
 8848h    non-loaded or nonexistent VLM called
 884Dh    no more SFT entries (too many handles)
 8850h    too many reply fragments
 8853h    ???
 89xxh    error generated by server
    low byte = return code from server (see also #1185,#1219)
 8900h    server successful
 8901h    out of disk space
 897Eh    NCP boundary check failed
 897Fh    ???
 8980h    lock failed; file in use
 8981h    out of handles
 8982h    no open privileges
 8983h    hard (non-correctable) I/O error
 8984h    no creation privileges
 8985h    no create/delete privileges
 8986h    attempted to create a file which already exists read-only
 8987h    filename error during creation (wildcards in name)
 8988h    invalid file handle
 8989h    no search privileges
 898Ah    no deletion privileges
 898Bh    no rename privileges
 898Ch    no modify privileges
 898Dh    some affected files are in use
 898Eh    all affected files are in use
 898Fh    some affected files are read-only
 8990h    all affected files are read-only; volume read-only
 8991h    some files could not be renamed because target names already exist
 8992h    all affected names exist
 8993h    no read privileges
 8994h    no write privileges
 8995h    file detached
 8996h    server out of memory
 8997h    no disk space for spool file
 8998h    disk map error; volume does not exist
 8999h    directory full
 899Ah    attempt to rename across volumes
 899Bh    bad directory handle
 899Ch    invalid path; no more trustees
 899Dh    no directory handles
 899Eh    bad filename
 899Fh    directory active
 89A0h    directory not empty
 89A1h    directory I/O error
 89A2h    I/O lock error
 89A3h-89BEh ???
 89BFh    invalid name space
 89C0h    no account privileges
 89C1h    no account balance
 89C2h    credit limit exceeded
 89C4h    account disabled
 89C5h    login lockout (intruder detection activated)
 89C6h    no console rights
 89C7h-89CFh
 89D0h    queue error
 89D1h    no queue
 89D2h    no queue server
 89D3h    no queue rights
 89D4h    queue full
 89D5h    no queue job
 89D6h    no job rights; unencrypted password
 89D7h    queue servicing error; duplicate password; bad account
 89D8h    queue not active; password too short
 89D9h    station not queue server; maximum logins exceeded
 89DAh    queue halted; bad login time
 89DBh    maximum queue servers; unauthorized login station
 89DCh    account disabled or expired
 89DEh    password expired (all grace logins used up)
 89DFh    password expired but login allowed (grace login)
 89E0h-89E6h ???
 89E7h    no disk track
 89E8h    property is not an item property; write to group
 89E9h    member exists
 89EAh    no such member
 89EBh    property is not a set property
 89ECh    no such set
 89EDh    property exists
 89EEh    object exists
 89EFh    illegal name
 89F0h    illegal wildcard
 89F1h    invalid bindery security level
 89F2h    not allowed to read object
 89F3h    not allowed to write/rename object
 89F4h    not allowed to delete object
 89F5h    not allowed to create object
 89F6h    not allowed to delete property
 89F7h    not allowed to create property; attempt to use non-local drive
 89F8h    not allowed to write property; already attached to server
 89F9h    not allowed to read property; no free connection slots
 89FAh    temporary remap error; no more server slots
 89FBh    no such property; invalid parameters
 89FCh    no such object; internet packet request canceled; unknown file server
 89FDh    bad station number; lock collision
 89FEh    directory locked; bindery locked; timeout
 89FFh    general error; hard error; lock error
Note:    some server-generated error codes have multiple interpretations; use
      the one appropriate to the failing call

(Table 2046)
Values for VLM identifier:
 0001h    VLM.EXE        Virtual Loadable Modules manager (see also #2049)
 0010h    CONN.VLM    connection table manager (see also #2050)
 0020h    TRAN.VLM    transport protocol multiplexor (see also #2054)
 0021h    IPXNCP.VLM    transport protocol implementation using IPX (see #2056)
 0022h    TCPNCP.VLM    TCP/IP transport
 0030h    NWP.VLM        NetWare protocol multiplexor (see also #2058)
 0031h    BIND.VLM    bindery
 0032h    NDS.VLM        NetWare Directory Services (see also #2059)
 0033h    PNW.VLM        Personal NetWare
 0034h    RSA.VLM        RSA encryption for directory services re-authentication
 0040h    REDIR.VLM    DOS redirector (see also #2061)
 0041h    FIO.VLM        file I/O (see also #2063)
 0042h    PRINT.VLM    printer redirector (see also #2065)
 0043h    GENERAL.VLM    misc functions for NETx and REDIR (see also #2067)
 0050h    NETX.VLM    NetWare shell compatibility (see also #2069)
 0060h    AUTO.VLM    auto-reconnect/auto-retry
 0061h    SECURITY.VLM    enhanced security module
 0100h    NMR.VLM        NetWare management responder
 09F2h    DRVPRN.VLM    Desktop SNMP Services - Drive/Printer Mappings
 09F5h    SAA.VLM        SAA client API for Netware
 09F6h    IPXMIB.VLM    SNMP IPX-monitoring Module???
 09F7h    PNWMIB.VLM    Personal Netware SNMP Instrumentation Module
 09F8h    PNWTRAP.VLM    Personal Netware SNMP Trap Module
 09F9h    MIB2PROT.VLM    MIB-II Protocol Groups
 09FAh    MIB2IF.VLM    MIB-II Interfaces Group
 09FBh    NVT.VLM        ???
 09FCh    WSTRAP.VLM    Desktop SNMP Services - Trap Module
 09FDh    WSREG.VLM    Desktop SNMP Services - Registration Module
 09FEh    WSASN1.VLM    Desktop SNMP Services - ASN.1 Module
 09FFh    WSSNMP.VLM    Desktop SNMP Services - Agent Module

Format of VLM header:
Offset    Size    Description    (Table 2047)
 00h    DWORD    -> initialization entry point
 04h    DWORD    -> VLM API entry point
 08h    DWORD    -> ??? entry point
 0Ch    DWORD    -> ??? entry point
 10h    DWORD    -> ??? entry point
    ...
 var    DWORD    00000000h (end of entry point list)
      4 BYTEs    signature "NVlm"
    WORD    VLM identifier (see #2046)
---v1.20+ ---
 1Eh    WORD    ???
 20h    WORD    Transient Switch Count
 22h    WORD    VLM Call Count
 24h    WORD    Offset ControlBlocks (See #2048)
 26h    WORD    Current VLMID
 28h    BYTE    Memory Type
        00h=Conventional 02h=EMS 04h=XMS
 29h    BYTE    Modules Loaded
 2Ah    WORD    BlockId
 2Ch    WORD    Transient Block
 2Eh    WORD    Global Segment
 30h  3    DWORDs    pointers to AsyncQueue head, tail, and s???
 3Ch  3    DWORDs    pointers BusyQueue head, tail, and s???
 48h    WORD    ReEntrance Level
 4Ah    WORD    Full Map Count
 4Ch    WORD    ???
 4Eh 80 BYTEs    ASCIZ configuration file filename
Note:    the number of entry points in the header is reported as "Func" in the
      VLM /D display.

Format of VLM Control Block for VLM v1.20 [array]:
Offset    Size    Description    (Table 2048)
 00h    WORD    Flag
 02h    WORD    VLM Identifier (See #2046)
 04h    WORD    Func
 06h    WORD    Maps
 08h    WORD    number of times called
 0Ah    WORD    ???
 0Ch    WORD    Transient Segment
 0Eh    WORD    Global Segment
 10h    WORD    Address Low
 12h    WORD    Address High
 14h    WORD    TSegSize
 16h    WORD    GSegSize
 18h    WORD    SSegSize
 1Ah    BYTE    VLMName[9] ASCIZ
Note:    this information is shown in VLM /d under the dashed line. There are
      as many 35-byte blocks as modules loaded
SeeAlso: #2047

(Table 2049)
Call VLM Manager (VLM.EXE, ID 0001h) with:
Func    Description/Registers
 01h    VLM Notify
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    VLM Statistics
 04h    VLM internal use
    BX = function
        0000h get interrupt vector (calls INT 21/AH=35h)
        0001h begin critical section (calls INT 2F/AX=1681h)
        0002h end critical section (calls INT 2F/AX=1682h)
        0003h ???

(Table 2050)
Call Connection Manager (CONN.VLM, ID 0010h) with:
Func    Description/Registers
 01h    Conn Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    Conn Statistics
    CX = length of buffer
    ES:DI -> buffer for connection statistics (see #2051)
    Return: AX = status (0000h successful)
 04h    Conn Alloc Handle
    Return: AX = status (0000h successful)
        CX = connection handle
 05h    Conn Validate Handle
    CX = connection handle
    Return: AX = 0000h if valid handle
 06h    Conn Free Handle
    CX = connection handle
    Return: AX = status (0000h successful)
 07h    Conn Get Entry Field
    BH = connection parameter (see #2053)
    CX = connection handle
    DX = value if BH is non-array parameter
    DH = offset in array if BH is array parameter
    DL = number of bytes to copy if BH is array
    ES:DI -> return buffer if BH is array
    Return: AX = 0000h if successful
        DL/DX = value if non-array parameter
        DH = maximum number of bytes in buffer if array parameter
        DL = number of bytes copied if array
        BX destroyed
 08h    Conn Set Entry Field
    BH = connection parameter (see #2053)
    CX = connection handle
    DL/DX = value if BH is non-array parameter
    DH = offset in array if BH is array parameter
    DL = number of bytes to copy if BH is array
    DS:SI -> buffer if BH is array
    Return: AX = 0000h if successful
        DH = maximum number of bytes in buffer
        DL = number of bytes copied
        BX destroyed
 09h    Conn Reset Entry Field
    BH = connection parameter (see #2053)
    CX = connection handle
    Return: AX = 0000h if successful
        BX,DX destroyed
 0Ah    Conn Lookup Handle
    BL = lookup type (00h equal, 40h not equal)
    BH = connection parameter (see #2053)
    CX = connection handle, 0000h if first
    DL/DX = value if BH is non-array parameter
    DH = offset in array if BH is array parameter
    DL = number of bytes to copy if BH is array
    DS:SI (ES:DI???) -> buffer if BH is array
    Return: AX = 0000h if successful
        CX = handle matching given parameters
 0Dh    Conn Name Lookup
    CX = connection handle
    ES:DI -> 49-byte buffer for server name or 0000h:0000h
    Return: AX = 0000h if successful
        BX = length of server name
        ES:DI buffer filled if pointer not 0000h:0000h
 0Eh    Conn Name To Handle
    DS:SI -> uppercased server name
    CX = length of server name, 0000h if ASCIZ name
    Return: AX = error code or 0000h if successful
            CX = connection handle if successful
 0Fh    Conn Get Num Connections
    Return: AX = status (0000h if successful)
        DX = number of connections
        CX = segment of connection table
            first entry in table (See #2052)

Format of VLM connection statistics:
Offset    Size    Description    (Table 2051)
 00h    WORD    total length of statistics record (including this word)
 02h    WORD    number of connection handles allocated
 04h    WORD    average name length (configured in NET.CFG)
 06h    WORD    maximum number of tasks (configured in NET.CFG)
 08h    WORD    number of failed "allocate handle" calls
 0Ah    WORD    number of failed "add name" calls
 0Ch    WORD    number of failed task calls
Note:    some versions of the NetWare requester reportedly do not implement
      this correctly
SeeAlso: #2050

Format of NetWare VLM Connection Table [array]:
Offset    Size    Description    (Table 2052)
 00h    WORD    Protocol VLMid      0032(NDS) 0031(BIND)        Func 07 equiv.
                  0033(PNW) 0000(unused)       bh=01h
 02h    BYTE    (connection status)
        bit 6: connection locked               bh=16h
        bit 5: authenticated                   bh=03h
        bit 4: permanent                   bh=02h
        bit 2: broadcast msg waiting               bh=12h
 03h    BYTE    (connection capabilities)
        bit 5: Large Internet Packets               none
        bit 3: Packet Burst Reset               bh=07h
        bit 2: Max I/O                       bh=06h
        bit 1: SFT3 change                   bh=05h
        bit 0: Packet Burst Support               bh=04h
 04h    WORD    reference count                       bh=09h
 06h    WORD    soft resource count                   bh=15h
 08h    BYTE    NCP Order Number                   bh=0Eh
 09h    BYTE    Server security options                   bh=14h
        bit 0: CRC enabled
        bit 1: packet signing required
        bit 5: packet signing enabled
 0Ah    BYTE    OS Major Version                   bh=08h
 0Bh    BYTE    OS Minor Version                   bh=08h
 0Ch    WORD    Hops to Server                       bh=0Ah
 0Eh    WORD    Maximum Packet Size for this connection           bh=0Bh
 10h    WORD    LIP Parameters                       bh=13h
 12h    WORD    NCP Request Type                   bh=10h
 14h    BYTE    NCP Sequence                       bh=0Ch
 15h    WORD    Connection Number                   bh=0Dh
 17h    BYTE    ???                           none
 18h    WORD    Transport VLMid 21(IPXNCP) 22(TCPNCP)           bh=0Fh
 1Ah    BYTE    Node Address[4]                       bh=11h
 1Eh    BYTE    Network[6]                       bh=11h
 24h    BYTE    Socket[2]                       bh=11h
 26h    BYTE    Local Target[6]                       bh=11h
 2Ch    WORD    Round Trip Time                       bh=11h
 2Eh    WORD    ???                           none
SeeAlso: #2050

(Table 2053)
Values for NetWare Connection Manager CEI (Connection Entry Information):
 number    flags    description
 00h    FR    error
 01h    WL    VLM id of transport protocol (NDS/BIND/PNW)
        00h = wildcard
 02h    FR    permanent flag (01h if connection is permanent)
 03h    F    authenticated flag (01h if connection is authenticated)
 04h    F    packet burst supported
 05h    FR    SFT3 change status
 06h    FR    connection needs maximum I/O transmission
 07h    FR    packet burst reset needed
 08h    W    server version
 09h    W    reference count (tasks using connection, 00h = dynamic)
 0Ah    W    distance to server associated with connection
 0Bh    W    maximum packet size supported by transport protocol
 0Ch    B    NCP sequence number
 0Dh    W    connection number
 0Eh    B    NCP order number
 0Fh    WL    VLM id for transport protocol
        00h = wildcard, 21h = IPX, 22h = TCP
 10h    W    NCP request type
 11h    A    transport specific buffer
        12 byte server address
        6 byte    router address
        2 byte round trip time
 12h    FR    broadcast message waiting
 13h    W    large internet packets supported
 14h    B    security options
        bit 0: CRC enabled
        bit 1: packet signing enabled
        bit 5: packet signing active
 15h    W    soft resource count
 16h    FR    connection locked
Note:    flag meanings
        F=flag value
        B=byte value
        W=word value
        A=array
        R=resettable
        L=settable only before authentication
        others=read only
SeeAlso: #2050

(Table 2054)
Call TRAN.VLM (VLM ID 0020h) with:
Func    Description/Registers
 01h    TRAN Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    TRAN Statistics
 06h    TRAN Request Reply (see INT 21/AH=F2h)
    AL = request code (see #1355 at INT 21/AH=F2h)
    BH = error handler flag
        00h default error handler
        01h return network errors to caller
        02h handle network errors in requester
    BL = request list length (max 5 fragments) (see #2055)
    CX = connection handle
    DH = 00h (reserved)
    DL = reply list length (max 5 fragments) (see #2055)
    DS:SI -> address list (each element is DWORD address + WORD length)
    ES:DI -> address list
    Return: AX = error code, 0000h if successful
        BX,DX destroyed
        reply buffer updated if successful
 08h    TRAN Schedule/Cancel Event
 09h    TRAN Get Max Phys Size
    ??? = subfunction
        00h get maximum node size
        01h get maximum route size to specified server
 0Ah    TRAN Broadcast Mux

Format of TRAN.VLM request/reply fragment descriptor (array):
Offset    Size    Description    (Table 2055)
 00h    DWORD    address of buffer
 04h    WORD    length of buffer

(Table 2056)
Call IPXNCP.VLM (VLM ID 0021h) with:
Func    Description/Registers
 01h    IPX Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    IPX Statistics
    CX = length of buffer
    ES:DI -> buffer for statistics (see #2057)
    Return:    AX = status (see #2045)
 06h    IPXNCP Request Reply???
    functionally equivalent to Tran Request Reply???

Format of NetWare IPX statistics:
Offset    Size    Description    (Table 2057)
 00h    WORD    size of statistics, including this word
 02h    DWORD    number of TRAN Request Reply calls made
 06h    WORD    number of user aborts
 08h    WORD    number of user retries
 0Ah    WORD    IPX receive errors
 0Ch    WORD    IPX send errors
 0Eh    WORD    number of unrecognized responses
 10h    WORD    number of bad connection numbers in requests
 12h    WORD    number of bad sequence responses
 14h    WORD    receive buffer overflows
 16h    WORD    number of times route to attached server was lost
 18h    WORD    number of times server responded "busy"
 1Ah    WORD    number of unknown "NCPRepCompCode" values
 1Ch    WORD    number of bad connection numbers in responses
 1Eh    WORD    padding for NETX compatibility
 20h    WORD    padding for NETX compatibility
 22h    WORD    number of attach requests to server without route
 24h    WORD    number of times server responded to attach without slot
 26h    WORD    number of times a server went down during a request
 28h    DWORD    same-server optimizations
 2Ch    WORD    local route changes
 2Eh    WORD    IPX CRC errors
 30h    WORD    number of user fails
 32h    BYTE    flag: CRCs enabled
 33h    BYTE    flag: LIP enabled
 34h    BYTE    flag: configurable NET error handler
SeeAlso: #2056

(Table 2058)
Call NWP.VLM (VLM ID 0030h) with:
Func    Description/Registers
 01h    NWP Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    NWP Statistics
 04h    NWP Connect
 05h    NWP Disconnect
 06h    NWP Attach
 08h    NWP Login
 09h    NWP Logout
 0Ah    NWP Get Bindery Object/Get Message Handler
    BX = subfunction
        0002h set workstation's broadcast message mode
        0003h get object ID for object name
        0004h get object name for object ID
        0005h retrieve broadcast message
 0Ch    NWP context (passed through to NDS.VLM's function 0Ch) (see #2059)
 0Eh    NWP Ordered Send To All
 0Fh    NWP Preferred Handler
    BX = subfunction
        0000h get preferred connection name
        DX = VLM ID (NDS/BIND/PNW)
        ES:DI -> 49-byte buffer for connection name
        Return: ES:DI buffer filled
        0001h set preferred connection name
        DX = VLM ID (NDS/BIND/PNW)
        CX = length of connection name (may be 0000h, max 48)
        DS:SI -> name of preferred connection
        0002h get preferred connection ID
        DX = VLM ID (NDS/BIND/PNW)
        Return: AX = status
            CX = connection handle if successful
        0003h get server address
        CX = connection handle or 0000h
        DS:SI -> name to be resolved
        ES:DI -> 12-byte buffer for server address
 10h    NWP ???
    BX = subfunction
        0001h get security flags (see also INT 21/AX=B301h)
        Return: BX:CX indicates signature level
                = 0100h:0000h if signature level=0
                = 0300h:0000h if signature level=1
                = 0302h:0000h if signature level=2
                = 0302h:0202h if signature level=3
        0002h create session keys (see also INT 21/AX=B302h)
        CX = server connection handle
        DS:SI -> 24-byte input buffer
        0004h set security flags (see also INT 21/AX=B304h)
        BL:CL = new flags
        0006h renegotiate security level (see also INT 21/AX=B306h)
        CX = server connection number (01h-08h)

(Table 2059)
Call NDS.VLM (VLM ID 0032h) with:
Func    Description/Registers
 01h    NDS Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    NDS Statistics
 06h    NDS Attach
    CX = allocated connection handle
    DS:SI -> server address
 08h    NDS Fragment Requst
    Return: AX = 8836h (invalid parameter)
    Note:    this function was documented but does not work
 0Ch    NDS context
    BX = subfunction
        0000h get default name context
        CX = length of buffer for default context
        ES:DI -> buffer to receive name
        Return: ES:DI buffer filled
        0001h set default context
        CX = length of new default context name
        DS:SI -> context name
        0002h read from TDS
        CX = reply buffer length
        DX = 0110h ???
        SI = offset in TDS
        ES:DI -> reply buffer
        0003h write to TDS
        0005h "NWDSChangeResourceConnection/Lock Connection"
        CX = connection handle
        DL = subfunction (00h-09h)
            04h = NWDSChangeResourceOnConnection
            07h = NWDSChangeResourceOnConnection
            08h = NWDSLockConnection
        0006h NDS change connection state (internal)
        CX = connection handle
        AL = 00h or 01h
        0007h "NWDSSetMonitoredConnection"
        AX = subfunction
            0001h get monitored connection
            Return: CX = connection handle???
            0002h set monitored connection
            CX = connection handle???
        0008h send NDS request
        AX = NDS function
        CX = connection handle
        DS:SI -> request buffer descriptor (see #2060)
        ES:DI -> reply buffer descriptor (see #2060)
        000Ah set NDS CEI Info
        DL = buffer length
        DS:SI -> input buffer

Format of NetWare NDS request/reply buffer descriptor:
Offset    Size    Description    (Table 2060)
 00h    DWORD    -> buffer
 04h    WORD    length of buffer in bytes
SeeAlso: #2059

(Table 2061)
Call REDIR.VLM (VLM ID 0040h) with:
Func    Description/Registers
 01h    Redir Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    Redir Statistics
 04h    Redir Build SFT (see INT 21/AH=B4h"NetWare")
    CX = connection handle
    ES:DI -> SFT build request (see #2062)
    Return: AX = 0000h if successful
            BX = DOS file handle
 05h    Redir DOS To NW Handle
 08h    Redir Specific
    BX = 0000h get item
        DS:SI -> ASCIZ string "LPTx" (x='1'-'9') or drive spec ("d:")
        ES:DI -> 512-byte reply buffer for
              "\\server\resource",00h,"path",00h

Format of NetWare SFT build request:
Offset    Size    Description    (Table 2062)
 00h  6 BYTEs    NetWare handle
 06h    WORD    reserved for internal use
 08h 14 BYTEs    ASCIZ filename
 16h    BYTE    DOS file attributes
        bit 7: file is shareable
 17h    BYTE    reserved
 18h    LONG    file size
 1Ch    WORD    creation date
 1Eh    WORD    last access date
 20h    WORD    last update date
 22h    WORD    last update time

(Table 2063)
Call File I/O FIO.VLM (VLM ID 0041h) with:
Func    Description/Registers
 01h    FIO Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    FIO Statistics
    CX = length of buffer
    ES:DI -> buffer for statistics (see #2064)
    Return: AX = status (0000h if successful)
        buffer filled if successful
 04h    FIO Remote Copy

Format of NetWare FIO statistics:
Offset    Size    Description    (Table 2064)
 00h    WORD    length of statistics record (including this word)
 02h    WORD    number of read requests
 04h    WORD    number of write requests
 06h    WORD    number of cache read hits
 08h    WORD    number of cache write hits
 0Ah    WORD    number of cacheable files with free blocks
 0Ch    WORD    number of cacheable files without free blocks
 0Eh    WORD    number of standard read requests
 10h    WORD    number of standard write requests
 12h    WORD    number of burst read requests
 14h    WORD    number of burst write requests
 16h    BYTE    flag: cache writes enabled
 17h    BYTE    flag: true commits enabled
 18h    WORD    number of cache blocks
 1Ah    WORD    size of a cache buffer
 1Ch    WORD    number of ECBs for packet bursts (0000h if bursts disabled)
SeeAlso: #2063

(Table 2065)
Call PRINT.VLM (VLM ID 0042h) with:
Func    Description/Registers
 01h    Print Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    Print Statistics
 04h    Print Get/Set Data
    BX??? = subfunction
        00h set printer control flags
        01h get printer control flags
        02h set extended printer control flags
        03h get extended printer control flags
 05h    Print Open Capture File
 07h    Print Get Num Of Printers
 08h    Print Redirection
    BX = subfunction
        0000h redirect device to queue
        AX = length of queue name, 0000h to use queue ID
        DS:SI -> uppercased ASCIZ queue name
        ES:DI -> queue ID, 0000h:0000h to use queue name
        0001h test whether device is redirected
        0002h cancel redirection
        0003h redirect device to file
        AX = 0000h or 4E57h ('NW')
        ES:DI -> ASCIZ path of file
        0004h get extended redirection information
    CX = connection handle
    DX = printer (0=LPT1)
    Return: AX = 0000h if successful
 09h    Print Flush And Close Job
 0Ch    Print Get/Set Banner Name

Format of PRINT.VLM standard print control information:
Offset    Size    Description    (Table 2066)
 00h    BYTE    PFStatus (reserved, 00h)
 01h    BYTE    print flags (default 80h)
        bit 2: release job for printing if capture interrupted
        bit 3: suppress form feed
        bit 4: notify
        bit 6: text file
        bit 7: print banner
 02h    BYTE    tab size (01h-12h, default 08h)
 03h    BYTE    number of copies (default 01h)
 04h    BYTE    ???
 05h    BYTE    form type to be mounted in printer (default 00h)
 06h    BYTE    reserved (00h)
 07h 14 BYTEs    banner
 15h    BYTE    capture printer (LPT) number
 16h    WORD    capture timeout in seconds
 18h    BYTE    job concatenation flag (00h or 01h, default 00h)
 19h    BYTE    maximum lines per page (default 66)
 1Ah    BYTE    ???
 1Bh    BYTE    maximum characters per line (default 132)
 1Ch    BYTE    ???
 1Dh 13 BYTEs    name of form to be mounted in printer
 2Ah    BYTE    flag: capture active (00h or FFh, default 00h)
 2Bh    BYTE    flag: capturing to file (00h or 01h, default 00h)
 2Ch    BYTE    flag: timeout field is being decremented (default 00h)
 2Dh    DWORD    -> printer setup string
 31h    DWORD    -> printer reset string
 35h    BYTE    reserved (01h)
 36h    BYTE    flag: job has started printing (00h or FFh, default 00h)
 37h    BYTE    flag: job placed in queue (00h or FFh, default 00h)
 38h    BYTE    flag: PJobValid (00h or FFh, default 00h)
 39h    DWORD    print-queue ID
 3Dh    BYTE    low byte of print-job number (default 00h)
 3Eh    BYTE    ???
 3Fh    BYTE    number of chars in INT 17h print cache buffer (default 00h)
 40h    BYTE    ???
 41h    BYTE    high byte of print-job number (default 00h)
SeeAlso: #2065

(Table 2067)
Call GENERAL.VLM (VLM ID 0043h) with:
Func    Description/Registers
 01h    Gen Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    Gen Statistics
    CX = length of statistics buffer
    ES:DI -> buffer for statistics (see #2068)
    Return: AX = status (see #2045)
 04h    Gen Get/Set Primary
    BX = subfunction
        0001h get primary connection
        CX = primary connection handle to be retrieved
        Return: AX = status (see #2045)
            CX = primary connection handle
        0002h set primary connection
        CX = primary connection handle to be stored
        Return: AX = status (see #2045)
 06h    Gen Specific
    BX = subfunction
        0000h get command processor and master environment addresses
        Return: DX = segment of master environment
            ES:DI -> command processor's private COMSPEC= copy
        0001h get default or primary connection
        Return: AX = status (0000h successful)
            CX = connection handle if successful
        0002h last queue information
        AL = operation
            00h zap
            01h set
            02h get
        DI:DX = queue file handle
        CX = connection handle
        Return: AX = status (0000h successful)
            DI:DX = queue file handle
            CX = connection handle or 0000h if queue info invalid
        0003h get/set machine name(s)
        AX = name type
            00h get short machine name
            02h get long machine name
            04h set short machine name
            06h set long machine name
            08h get DOS name
            0Ah set DOS name
        ES:SI -> ASCIZ name if setting
        Return: AX = status (0000h if successful)
            ES:SI -> ASCIZ name if getting
        0004h set per-task EXEC search mode
        Return: AX = status (0000h if successful)
 09h    Gen Return Drive Info
    BX = subfunction
        0000h get first available drive
        Return: AX = status (see #2045)
            BX = drive letter of first drive
        0001h get Lastdrive
        Return: AX = status (see #2045)
            CH = number lastdrive 1=A: - 1Ah=Z:

Format of NetWare GENERAL.VLM statistics:
Offset    Size    Description    (Table 2068)
 00h    WORD    size of statistics record, including this word
 02h    DWORD    previous INT 21 vector
SeeAlso: #2067

(Table 2069)
Call NETX.VLM (VLM ID 0050h) with:
Func    Description/Registers
 01h    NetX Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    NetX Statistics

(Table 2070)
Call SECURITY.VLM (VLM ID 0061h) with:
Func    Description/Registers
 01h    Security Get Version
    BX = function
        0000h get version
        Return: AX = status (see #2045)
            BX = major version of VLM supported (0001h)
            CX = minor version of VLM supported (0000h)
 03h    Security Statistics
 04h    ???
    AL = subfunction
        01h compute session key
        DS:SI -> 24-byte input buffer
        ES:DI -> 8-byte output buffer
--------N-2F7A20BX0001-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET VLM CallA ADDRESS
    AX = 7A20h
    BX = 0001h
Return: AX = 0000h if request was handled
        ES:BX -> CallA entry point (see #2071)

(Table 2071)
Call VLM CallA entry point with:
    AX = function
        0000h submit
        0001h cancel (not implemented)
    ES:DI -> Overlay Asynchronous Control Block structure (see #2072)

Format of Overlay Asynchronous Control Block (OACB):
Offset    Size    Description    (Table 2072)
 00h    DWORD    link to next OACB, 0000h:0000h if last
 04h    DWORD    callback address or 0000h:0000h
 08h    BYTE    InUse flag (00h if complete)
 09h    BYTE    flag, reserved for VLM use
 0Ah    WORD    destination VLM
 0Ch    WORD    destination function
 0Eh    WORD    temporary storage for VLM.EXE
 10h  6 BYTEs    reserved
 16h  6 DWORDs    EAX,EBX,ECX,EDX,ESI,EDI
 2Eh  4 WORDs    DS,ES,FS,GS (FS and GS not used)
--------N-2F7A20BX0002-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET VLM MULTIPLEX ADDRESS
    AX = 7A20h
    BX = 0002h
Return: AX = 0000h
    ES:BX -> VLM multiplex entry point (see #2073)
Note:    for v1.10, this function is only available while VLM.EXE is loading
      the .VLM modules, because ES is destroyed on return

(Table 2073)
Call DOS Requester entry point with:
    BX = function???
        0000h
        DX = ???
        DI = ???
        BP = ???
        0002h
        CX = ???
        0003h
        DX = ???
        BP = ???
        0006h
        AH = subfunction???
        AL = ???
        STACK: variable (0, 4, 10, 14 bytes seen)
--------N-2F7A20BX0003-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET VLM PARSE API ADDRESS
    AX = 7A20h
    BX = 0003h
Return: AX = 0000h if request was handled
        ES:BX -> VLM parse API entry point
--------N-2F7A20BX0004-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET VLM MULTICAST CALLOUT
    AX = 7A20h
    BX = 0004h
Return: AX = 0000h if request was handled
        ES:BX -> VLM multicast data (see #2074)

Format of DOS Requester data:
Offset    Size    Description    (Table 2074)
 00h    DWORD    pointer to ??? (code)
 04h  4 BYTEs    ???
 08h    DWORD    pointer to ??? (code) (see #2075)
    ???

(Table 2075)
Call offset 08h function with:
    AL = function (00h-07h)
    ???
Return: ???
--------N-2F7A20BX0005-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET VLM INT 24 ADDRESS
    AX = 7A20h
    BX = 0005h
Return: AX = 0000h if request was handled
        ES:BX -> VLM INT 24 handler
--------N-2F7A20BX0006-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET ??? ENTRY POINT
    AX = 7A20h
    BX = 0006h
Return: AX = 0000h if request was handled
        ES:BX -> ??? entry point (RETF in v1.03 and v1.10)
--------N-2F7A20BX0007-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET ??? ENTRY POINT
    AX = 7A20h
    BX = 0007h
Return: AX = 0000h
    ES:BX -> ??? entry point (RETF in v1.03 and v1.10)
--------N-2F7A20BX0008-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET ??? ENTRY POINT
    AX = 7A20h
    BX = 0008h
Return: AX = 0000h
    ES:BX -> ??? entry point (RETF in v1.03 and v1.10)
--------N-2F7A20BX0080-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET ??? ENTRY POINT
    AX = 7A20h
    BX = 0080h
Return: AX = 0000h
    ES:BX -> ??? entry point (RETF in v1.03 and v1.10)
Note:    this function is identical to AX=7A20h/BX=0006h in v1.03 and v1.10
--------N-2F7A20BX0081-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET ??? ENTRY POINT
    AX = 7A20h
    BX = 0081h
Return: AX = 0000h
    ES:BX -> ??? entry point (RETF in v1.03 and v1.10)
Note:    this function is identical to AX=7A20h/BX=0007h in v1.03 and v1.10
--------N-2F7A20BX0082-----------------------
INT 2F - Novell NetWare - DOS Requester v1.03+ - GET ??? ENTRY POINT
    AX = 7A20h
    BX = 0082h
Return: AX = 0000h
    ES:BX -> ??? entry point (RETF in v1.03 and v1.10)
Note:    this function is identical to AX=7A20h/BX=0008h in v1.03 and v1.10
--------N-2F7A21-----------------------------
INT 2F C - Novell NetWare - DOS Requester - BROADCAST CALLBACK
    AX = 7A21h
    CX = server connection (FFFFh if message from Personal NetWare user)
    interrupts disabled
Return: CX = 0000h if broadcast handled
    interrupts disabled
Note:    this function is only linked into INT 2F when INT 21/AH=DEh/DL=05h
      has been issued
SeeAlso: AX=7A22h,AX=7A85h,INT 21/AH=DEh
--------N-2F7A22-----------------------------
INT 2F C - Novell NetWare - DOS Requester - BROADCAST/SFT3 INFORM
    AX = 7A22h
    DL = function
        21h ('!') broadcast waiting for workstation
        40h ('@') SFT3 server-change inform
    BX = transport type
        0021h IPX
        0022h TCP
    ES:SI -> transport-specific data block
        (ECB for IPX, undefined for TCP)
    interrupts disabled
Return: AX = 0000h if event handled, unchanged if not
    interrupts disabled
Note:    this callback is made from within a hardware interrupt handler; a
      separate call to AX=7A21h is made once the system is in a safe
      state for receiving the message
SeeAlso: AX=7A21h
--------N-2F7A2F-----------------------------
INT 2F U - Novell NetWare - IPXODI v2.12 - GET GNMA SUPPORT
    AX = 7A2Fh
Return: AX = 0000h if supported and active
        BX = support level (0001h)
        ES:DI -> GNMA entry point (see #2076)
Program: GNMA is the Generic NetWare Management Agent
Note:    IPXODI v2.12 is distributed as part of the Personal NetWare system
      bundled with Novell DOS 7
SeeAlso: INT 7A/BX=001Fh

(Table 2076)
Call IPXODI GNMA entry point with:
    BX = function
        0000h ???
        ES:SI -> ??? data
        0001h ???
        AX = ???
        Return: ES:SI -> ??? data
        0002h get ??? address
        Return: ES:SI -> ??? buffer
        0003h send SPX packet???
        AL = ???
        CX = ???
        DX = ???
        SI = ???
        Return: ??? (registers from a call to INT 7A/BX=0016h)
Return: BX corrupted
--------N-2F7A2FBX0EDC-----------------------
INT 2F U - Personal NetWare - HRMIB - UNINSTALL
    AX = 7A2Fh
    BX = 0EDCh ('EDC' = Novell European Development Center)
Return: ???
SeeAlso: AX=7AA0h
--------N-2F7A40-----------------------------
INT 2F U - Novell NetWare - TCP/IP Protocol Stack - INSTALLATION CHECK
    AX = 7A40h
Return: AX = 7AFFh if installed
        BX = ??? bit flags (see #2077)
        CX = version (CH=major, CL=minor)
        DX = 0000h
        ES:DI -> entry point for TCP/IP stack (see #2078)
Notes:    Novell's LAN Workplace for DOS TCPIP.EXE also supports this interface
    this function is also supported by the Beame&Whiteside BWLWP40 shim,
      but it only returns AL and ES:DI, and does not support AX=7A41h
SeeAlso: AX=7A41h,INT 15/AX=DE2Eh,INT 60"Excelan"

Bitfields for returned BX:
Bit(s)    Description    (Table 2077)
 0    ???
 1    ???
 15-2    reserved???

(Table 2078)
Call NetWare TCP/IP entry point with:
    ES:SI -> parameter block (see #2079)
Return: ES:SI parameter block updated

Format of NetWare TCP/IP parameter block:
Offset    Size    Description    (Table 2079)
 00h  4 BYTEs    ???
 04h    WORD    (ret) ???
 06h    WORD    (ret) ???
 08h    DWORD    -> FAR routine called if bit 7 of function code set
 0Ch    BYTE    flags???
 0Dh  7 BYTEs    ???
 14h    BYTE    (ret) ???
 15h    BYTE    (call) function code (bit 7 set if ???) (see #2080)
 16h    BYTE    socket number
 17h    BYTE    (ret) result or error code
 18h  4 WORDs    parameter words 0 to 3 (see #2080 for usage)
 20h    WORD    length of packet sent/received
 22h    WORD    number of pointer/length pairs following
 24h 6N BYTEs    buffer descriptors, each
        Offset    Size    Description
         00h    DWORD    pointer to buffer
         04h    WORD    length of buffer

(Table 2080)
Values for NetWare TCP/IP function code:
 01h    "accept"
 02h    "bind"
 03h    close socket
    Call:    socket number field set
 04h    "connect"
 05h    get IP address
    Call:    socket number field set to 0000h
    Return:    parameter words 1 and 2 contain caller's IP address
 06h    get hardware address
 07h    "getpeername"
 08h    get socket name
 0Ah    get netmask
 0Bh    "ioctl"
 0Ch    "listen"
 0Dh    "select"
 10h    "shutdown"
 11h    open socket
    Call:    socket number field set to 0000h
        parameter word 0 = desired protocol (6 = TCP, 17 = UDP)
    Return: socket number set
 12h    "read"
 13h    "recvfrom"
    Call:    socket number set
        packet length and buffer descriptors set
    Return:    packet length and receive buffers updated
        parameter word 1 = source port number
        parameter words 2 and 3 = source IP address
 14h    "write"
 15h    "sendto"
    Call:    socket number set
        flags field = ???
        parameter word 0 = 0000h
        parameter word 1 = destination port number
        parameter words 2 and 3 = destination IP address
        packet length and buffer descriptors set
 16h    get BOOTP data
Note:    these functions are based on the Unix socket interface
--------N-2F7A41-----------------------------
INT 2F - Novell NetWare - TCP/IP Protocol Stack - WINDOWS SUPPORT???
    AX = 7A41h
    ES:DI -> FAR entry point for ??? (will be called with BX=1,2,3,4)
Return: AX = 7AFFh if supported
        BX = ??? (see #2077)
        CX = version (CH=major, CL=minor)
        DX = 0000h
        ES:SI -> DWORD containing passed value of ES:DI
        ES:DI -> entry point for TCP/IP stack
Notes:    Novell's LAN Workplace for DOS TCPIP.EXE also supports this interface
    the pointer which is set to ES:DI is cleared to 0000h:0000h when
      a Windows exit broadcast is received
SeeAlso: AX=7A40h
--------N-2F7A42-----------------------------
INT 2F - Novell NetWare - TCPIP.EXE v4.1 - GET ??? ENTRY POINT
    AX = 7A42h
Return: AX = 7AFFh if supported
        ES:DI -> ??? entry point (see #2081)

(Table 2081)
Call NetWare TCPIP.EXE entry point with:
    DX = ???
    ES:DI -> ??? (see #2082)
Return: AX = 0000h
    other registers destroyed

Format of data buffer:
Offset    Size    Description    (Table 2082)
 00h    WORD    offset of WORD ??? or 0000h
 02h    WORD    offset of DWORD ??? or 0000h
 04h    WORD    offset of DWORD ??? or 0000h
--------N-2F7A43-----------------------------
INT 2F - Novell NetWare - TCPIP.EXE v4.1 - GET ???
    AX = 7A43h
Return: AX = 7AFFh if supported
        DX = offset of ???
SeeAlso: AX=7A44h
--------N-2F7A44-----------------------------
INT 2F - Novell NetWare - TCPIP.EXE v4.1 - SET ???
    AX = 7A44h
    DX = offset of ??? (see AX=7A43h)
Return: AX = 7AFFh if supported
SeeAlso: AX=7A43h
--------N-2F7A4C-----------------------------
INT 2F - Novell NetWare - TCPIP.EXE v4.1 - GET ???
    AX = 7A4Ch
Return: AX = 7AFFh if supported
        BX = ??? (0037h)
        CX = ??? (001Ch)
--------N-2F7A4DBX0001-----------------------
INT 2F - Novell NetWare - ???
    AX = 7A4Dh
    BX = 0001h
    ES:DI -> ???
Return: AL = FFh if ???
        ES:DI -> ???
Note:    called by NETBIOS.EXE v3.01
--------N-2F7A4E-----------------------------
INT 2F - Novell LAN Workplace for DOS - RARPD.EXE - INSTALLATION CHECK
    AX = 7A4Eh
Return: AX = 7AFFh if installed
SeeAlso: AX=7A4Fh"RARPD"
--------N-2F7A4F-----------------------------
INT 2F - Novell LAN Workplace for DOS - RARPD.EXE - UNINSTALL
    AX = 7A4Fh
Return: AX = 7AFFh if installed
    DX,ES destroyed
Note:    this call conflicts with SNMP.EXE (both RARPD and SNMP are supplied
      with LAN Workplace for DOS!), such that running SNMP will uninstall
      RARPD as SNMP checks whether it is already installed!
SeeAlso: AX=7A4Eh"RARPD",AX=7A4Fh/BX=0001h
--------N-2F7A4FBX0001-----------------------
INT 2F - Novell NetWare - SNMP.EXE - INSTALLATION CHECK
    AX = 7A4Fh
    BX = 0001h
Return: AX = 7AFFh if installed
Note:    this call conflicts with RARPD.EXE (both SNMP and RARPD are supplied
      with LAN Workplace for DOS!), such that running SNMP will uninstall
      RARPD as SNMP checks whether it is already installed!
SeeAlso: AX=7A4Fh"RARPD",AX=7A4Fh/BX=0002h
--------N-2F7A4FBX0002-----------------------
INT 2F - Novell NetWare - SNMP.EXE - ???
    AX = 7A4Fh
    BX = 0002h
Return: AL = status
        4Fh if failed
        FFh if successful
SeeAlso: AX=7A4Fh/BX=0001h
--------N-2F7A80-----------------------------
INT 2F C - Novell NetWare - SHELL 3.01d BROADCAST - ABNORMAL EXIT
    AX = 7A80h
Return: nothing
Notes:    called on abnormal exit of the NetWare shell to notify other Novell
      TSRs that it is unsafe to call the shell in the future.
    must be passed through so that all interested programs see the exit
    on receiving this call, IPXODI clears an internal pointer to a
      default value; Novell's NETBIOS.EXE clears its INT 21h pointer to
      0000h:0000h and stops calling it
SeeAlso: AX=7A81h
--------N-2F7A81-----------------------------
INT 2F C - Novell NetWare - SHELL 3.01d BROADCAST - SET SHELL INT 21 HANDLER
    AX = 7A81h
    CX:DX -> shell's INT 21h entry point
Return: nothing
Notes:    the shell calls this function as it loads to allow interested TSRs
      and drivers to make a local copy of the shell's entry point
    must be passed through so that all interested programs see it
--------N-2F7A85-----------------------------
INT 2F C - Novell NetWare - shell 3.01 - BROADCAST INFORM
    AX = 7A85h
    CX = broadcast server number
Return: CX = 0000h if broadcast message handled by another program
    CX unchanged if broadcast not handled
SeeAlso: AX=7A21h
--------N-2F7A90-----------------------------
INT 2F U - Novell NetWare - NETBIOS.EXE 3+ - INSTALLATION CHECK
    AX = 7A90h
Return: AL = 00h if present
        BX = ???
        CX = PSP segment of NETBIOS resident code
SeeAlso: AX=7AFEh
--------N-2F7AA0-----------------------------
INT 2F U - Personal NetWare - HRMIB - ???
    AX = 7AA0h
    BX = function
        0000h ???
        0001h ???
Return: ???
SeeAlso: AX=7A2Fh/BX=0EDCh
--------N-2F7AC1-----------------------------
INT 2F - LAN HiJack - LHR - DISABLE???
    AX = 7AC1h
Program: LAN HiJack is a NetWare utility by KDS Software which allows a user
      to take over control of a workstation remotely; LHR is the program
      run on the slave workstation
SeeAlso: AX=7AC8h,AX=7AC9h,AX=7ACFh
--------N-2F7AC2-----------------------------
INT 2F - LAN HiJack - LHR - SYNCHRONIZE SHIFT STATES???
    AX = 7AC2h
Note:    sets BIOS keyboard status byte to an internal variable
SeeAlso: AX=7AC3h,AX=7ACFh
--------N-2F7AC3-----------------------------
INT 2F - LAN HiJack - LHR - CLEAR ??? FLAG
    AX = 7AC3h
SeeAlso: AX=7AC2h,AX=7ACFh
--------N-2F7AC8-----------------------------
INT 2F - LAN HiJack - LHR - ENABLE FUNCTIONS
    AX = 7AC8h
    BL = function(s) to enable (see #2083)
SeeAlso: AX=7AC1h,AX=7AC9h,AX=7ACFh

Bitfields for LAN HiJack function(s) to enable/disable:
Bit(s)    Description    (Table 2083)
 0    ???
 1    remote keyboard enabled
 2    support remote's mouse
 3-7    unused
--------N-2F7AC9-----------------------------
INT 2F - LAN HiJack - LHR - DISABLE FUNCTIONS
    AX = 7AC9h
    BL = function(s) to disable (see #2083)
SeeAlso: AX=7AC1h,AX=7AC8h
--------N-2F7ACA-----------------------------
INT 2F - LAN HiJack - LHJ - ???
    AX = 7ACAh
    BL = ???
Return: ???
Program: LAN HiJack is a NetWare utility by KDS Software which allows a user
      to take over control of a workstation remotely; LHJ is the program
      run on the controlling workstation
--------N-2F7ACB-----------------------------
INT 2F - LAN HiJack - LHJ - ???
    AX = 7ACBh
    BX = ???
Return: ???
Note:    this function appears to be related to the keyboard
SeeAlso: AX=7ACCh
--------N-2F7ACC-----------------------------
INT 2F - LAN HiJack - LHJ - ???
    AX = 7ACCh
    BX = ???
Return: ???
Note:    this function appears to be related to the mouse
SeeAlso: AX=7ACBh
--------N-2F7ACFBX0000-----------------------
INT 2F - LAN HiJack - LHR - INSTALLATION CHECK
    AX = 7ACFh
    BX = 0000h
Return: BX = segment of resident code if installed
Program: LAN HiJack is a NetWare utility by KDS Software which allows a user
      to take over control of a workstation remotely; LHR is the program
      run on the slave workstation
--------N-2F7AF0-----------------------------
INT 2F - Novell NetWare - DOSNP.EXE v1.30G - INSTALLATION CHECK
    AX = 7AF0h
Return: AL = FFh if present
        ES = 7AF0h
        CX = PSP segment of resident code
--------N-2F7AF1-----------------------------
INT 2F - Novell NetWare - Access Server Driver - INSTALLATION CHECK
    AX = 7AF1h
    BL = sequence number (01h first driver, 02h second, 00h no driver)
Return: AX <> 7AF1h if present
        BH = total number of drivers
        ---if BL nonzero on entry---
        AL = number of ports provided by specified driver
        ES:DI -> driver entry point
              (see #2084,#2085,#2086,#2087,#2088,#2089,#2090,#2091)
        ES:DX -> ID string
SeeAlso: INT 7A/BX=001Ch

(Table 2084)
Call Access Server driver "initialize port" function with:
    AH = 01h
    AL = port number (00h-0Fh)
    ES:BX -> configuration parameter block (see #2097)
    interrupts disabled
Return: CF clear if successful
    CF set on error
SeeAlso: #2085

(Table 2085)
Call Access Server driver "get port status" function with:
    AH = 02h
    AL = port number (00h-0Fh)
    interrupts disabled
Return: CF clear if successful
        BL = transmitter status (see #2094)
        BH = receiver status (see #2095)
        DL = external status signals (see #2096)
    CF set on error
    interrupts disabled
SeeAlso: #2084,#2086,#2089

(Table 2086)
Call Access Server driver "get input from port" function with:
    AH = 03h
    AL = port number (00h-0Fh)
    CX = size of data buffer
    ES:BX -> buffer for data
    interrupts disabled
Return: CF clear if successful
    CF set on error
    interrupts disabled
    CX = number of bytes read
Note:    the driver will add a NUL to the buffer when a break signal is detected
SeeAlso: #2086,#2087

(Table 2087)
Call driver "send output data to port" function with:
    AH = 04h
    AL = port number (00h-0Fh)
    CX = number of bytes to send
    ES:BX -> buffer containing data
    interrupts disabled
Return: CF clear if successful
    CF set on error
    interrupts disabled
    CX = number of bytes actually written
SeeAlso: #2086,#2088

(Table 2088)
Call driver "get I/O character counts" function with:
    AH = 05h
    AL = port number (00h-0Fh)
    interrupts disabled
Return: CF clear if successful
        BX = number of bytes pending transmission
        CX = number of bytes available for reading
    CF set on error
    interrupts disabled
SeeAlso: #2086,#2087

(Table 2089)
Call driver "control XON/XOFF" function with:
    AH = 06h
    AL = port number (00h-0Fh)
    DL = new state
        (00h software flow control disabled, else enabled)
    interrupts disabled
Return: CF clear if successful
    CF set on error
    interrupts disabled
SeeAlso: #2090

(Table 2090)
Call driver "get error counts and statistics" function with:
    AH = 07h
    AL = port number (00h-0Fh)
    ES:BX -> buffer for statistics (see #2098)
    interrupts disabled
Return: CF clear if successful
        ES:BX buffer filled
    CF set on error
    interrupts disabled
SeeAlso: #2091,#2092,#2093

(Table 2091)
Call driver "general request" function with:
    AH = 08h
    AL = port number (00h-0Fh)
    DX = requested operations
        bit 0: flush transmit buffers
        bit 1: flush receive buffers
        bit 4: define XON/XOFF characters
    ES:BX -> XON/XOFF characters (see #2099) if DX bit 4 set
    interrupts disabled
Return: CF clear if successful
    CF set on error
    interrupts disabled

(Table 2092)
Call driver "deadman timer management" function with:
    AH = 09h
    AL = port number (00h-0Fh)
    BX = next time interval in seconds (0000h to disable timer)
    interrupts disabled
Return: CF clear
    interrupts disabled
SeeAlso: #2093

(Table 2093)
Call driver "get buffer sizes" function with:
    AH = 0Ah
    AL = port number (00h-0Fh)
    interrupts disabled
Return: CF clear if successful
       BX = size of transmit buffer
       CX = size of receive buffer
    CF set on error
    interrupts disabled
SeeAlso: #2092

(Table 2094)
Values for Access Server transmitter status:
 00h    uninitialized
 01h    ready, not transmitting
 02h    transmitting
 03h    XOFF received
 04h    transmitting, buffer full
 05h    XOFF received and buffer full

(Table 2095)
Values for Access Server receiver status:
 00h    uninitialized
 01h    ready
 02h    receive buffer full, data may have been lost

Bitfields for external status signals:
Bit(s)    Description    (Table 2096)
 7,6    undefined
 5    CTS active
 4    DSR active
 3    DCD active
 2,1    undefined
 0    ring indicator

Format of Access Server configuration parameter block:
Offset    Size    Description    (Table 2097)
 00h    BYTE    receive baud rate index
        00h 50 bps, 01h 75 bps, 02h 110 bps, 03h 134.5 bps,
        04h 150 bps, 05h 300 bps, 06h 600 bps, 07h 1200 bps,
        08h 1800 bps, 09h 2000 bps, 0Ah 2400 bps, 0Bh 3600 bps,
        0Ch 4800 bps, 0Dh 7200 bps, 0Eh 9600 bps, 0Fh 19200 bps,
        10h 38400 bps, 11h 57600 bps, 12h 115200 bps
 01h    BYTE    receive bits per character (0=5 bits..3=8 bits)
 02h    BYTE    receive stop bits
 03h    BYTE    receive parity
        00h none, 01h odd, 02h even, 03h mark, 04h space
 04h    BYTE    transmit baud rate index (same as receive baud rate)
 05h    BYTE    transmit bits per character (0=5 bits..3=8 bits)
 06h    BYTE    transmit stop bits
 07h    BYTE    transmit parity (same as receive parity)
 08h    BYTE    DTR state (00h off, 01h on)
 09h    BYTE    RTS state (00h off, 01h on)
 0Ah    BYTE    flow control (00h none, 01h XON/XOFF, 02h RTS/CTS, 03h both)
 0Bh    BYTE    break control (00h off, 01h on)

Format of Access Server statistics:
Offset    Size    Description    (Table 2098)
 00h    BYTE    port number
 01h    BYTE    external status signals (see #2096)
 02h    BYTE    transmitter status (see #2094)
 03h    BYTE    receiver status (see #2095)
 04h    DWORD    number of characters received
 08h    DWORD    number of characters transmitted
 0Ch    WORD    input parity errors
 0Eh    WORD    input framing errors
 10h    WORD    lost characters due to hardware overrun
 12h    WORD    lost characters due to data buffer overrun
Note:    the counts are not allowed to wrap around; once a count reaches FFFFh
      or FFFFFFFFh, it is no longer incremented

Format of Access Server XON/XOFF characters:
Offset    Size    Description    (Table 2099)
 00h    BYTE    04h (number of bytes following)
 01h    BYTE    transmit XON character
 02h    BYTE    transmit XOFF character
 03h    BYTE    receive XON character
 04h    BYTE    receive XOFF character
--------N-2F7AFE-----------------------------
INT 2F - Novell NetWare - DOSNP.EXE - INSTALLATION CHECK
    AX = 7AFEh
Return: AL = FFh if present
        ES = (data???) segment of DOSNP
Program: DOSNP.EXE provides "named pipes" support for DOS workstations running
       NetWare
Note:    the NetWare shell calls this function and refuses to load if DOSNP is
      present
SeeAlso: AX=7A90h
--------N-2F7AFFBX0000-----------------------
INT 2F - Novell NetWare - TBMI v1.1+ - INSTALLATION CHECK / Windows SUPPORT
    AX = 7AFFh
    BX = 0000h
    CX = 4E65h ("Ne")
    DX = 7457h ("tW")
    ES:DI -> Windows support procedure (see #2100)
Return: AL = FFh if installed
        CX = configured sockets (14h)
        DS:SI -> data table ???
        ES:DI -> IPX far call handler
Notes:    for IPX/SPX this call reportedly returns DS:SI pointing to the table
      of pointers to service events queue head and tail
    this function is also supported by IPXODI; v2.12 does not change DS,
      but does set SI to an internal address
SeeAlso: AX=7AFFh/BX=0001h

(Table 2100)
Values Windows support procedure called with:
    BP = function
        0001h Get ECB
        BX = socket number
        Return: ES:SI -> ECB or 0000h:0000h if none available
        0002h Count Listen ECBs
        AX = BX = socket
        Return: CX = number of listen ECBs for socket
                (must be >= 2 for SPX to work)
        0003h ???
        0004h Inform task switcher of ECB locations
        Note:    registers other than those listed above are equal
              to the values when IPX was called
Note:    the support function will not be called if IPX is called with BX
      bit 15 set
--------N-2F7AFFBX0001-----------------------
INT 2F - Novell NetWare - TBMI v1.1+, shell v3.01d - INSTALLATION CHECK???
    AX = 7AFFh
    BX = 0001h
    CX = 4E65h ("Ne")
    DX = 7457h ("tW")
Return: AL = FFh if installed
        CX = ???  (8000h)
        SI = ??? (or -> ???) (0002h and 0007h seen)
        ES:DI -> IPX far call handler
        ES:DX -> 6-byte data area ???
Note:    this function is also supported by IPXODI, but IPXODI v2.12 does not
      return ES:DX
SeeAlso: AX=7AFFh/BX=0000h
--------d-2F7F00-----------------------------
INT 2F - Jim Harper's CD-ROM redirector SCSI driver - INSTALLATION CHECK
    AX = 7F00h
Return: AL = FFh if installed
SeeAlso: AX=7F01h,AX=7F02h,AX=7F03h
--------d-2F7F01-----------------------------
INT 2F - Jim Harper's CD-ROM redirector SCSI driver - DO COMMAND
    AX = 7F01h
    DS:DX -> command record (see #2101)
Return: AL = status
        00h successful
        else error code
SeeAlso: AX=7F00h,AX=7F02h,INT 11/AH=FFh"SDLP",INT 21/AX=4402h"ASPI"
SeeAlso: INT 4F/AX=8100h

Format of CD-ROM redirector command record:
Offset    Size    Description    (Table 2101)
 00h    BYTE    ID
 01h 10 BYTEs    CDB (Command Descriptor Block) for operation
 0Bh    WORD    segment of buffer
 0Dh    WORD    offset of buffer
 0Fh    BYTE    status
 10h    BYTE    sense
 12h    WORD    count
--------d-2F7F02-----------------------------
INT 2F - Jim Harper's CD-ROM redirector SCSI driver - DO RESET
    AX = 7F02h
SeeAlso: AX=7F00h,AX=7F01h
--------d-2F7F03-----------------------------
INT 2F - Jim Harper's CD-ROM redirector SCSI driver - UNINSTALL
    AX = 7F03h
Return: AL = status
        00h successful
        01h unable to uninstall
SeeAlso: AX=7F00h
----------2F7F24-----------------------------
INT 2F - Multiplex - ???
    AX = 7F24h
    ???
Return: ???
Note:    called by PC/370, an IBM 370 emulator by Donald S. Higgins
----------2F7F26-----------------------------
INT 2F - Multiplex - ???
    AX = 7F26h
    ???
Return: ???
Note:    called by PC/370, an IBM 370 emulator by Donald S. Higgins
--------N-2F8000-----------------------------
INT 2F - EASY-NET - INSTALLATION CHECK
    AX = 8000h
Return: AL = 00h not installed
         FFh installed
Program: EASY-NET is a shareware two-machine serial-port network
--------N-2F8000-----------------------------
INT 2F - Nanosoft, Inc. TurboNET server - INSTALLATION CHECK
    AX = 8000h
Return: AL = FFh if installed
        BX = CS of resident code
        CX = ??? (03FCh)
Program: TurboNET is a NetBIOS-based file redirector and server; a
      demonstration version may be downloaded from Nanosoft's BBS
SeeAlso: AX=8100h
--------t-2F8000-----------------------------
INT 2F - CS_TSR specification - TSR INSTALLATION CHECK
    AX = 8000h
    DS:SI -> 4-byte CS_TSR signature (11h 43h 53h 10h)
Return: AL = status
        00h no CS_TSR-compliant TSRs installed
        01h installed, but signature did not match
        FFh installed, signature matches
        ES:DI -> resident process block (see #2102) of last installed
              TSR (if DS:SI pointed at signature on entry)
Program: the CS_TSR specification is a standardized TSR interface by Compact
      Soft group in Kiev, Ukraine
Desc:    determine whether any CS_TSR-compliant TSRs are installed on the
      selected multiplex number
Range:    AH=80h to AH=FFh
SeeAlso: AX=8001h"CS_TSR",AX=8002h"CS_TSR",AX=8003h"CS_TSR"

Format of CS_TSR process block:
Offset    Size    Description    (Table 2102)
 00h  4 BYTEs    CS_TSR signature 11h 43h 53h 10h
 04h    BYTE    INT 2F multiplex number
 05h    WORD    virtual process handle (unique among loaded TSRs)
 07h  2 BYTEs    version (binary minor version, then major version)
 09h    WORD    PSP segment of TSR
 0Bh    DWORD    pointer to ASCIZ program name
 0Fh  3 BYTEs    program creation date (day, month, year)
 12h  3 BYTEs    process start time (seconds, minutes, hours)
 15h  3 BYTEs    process start date (day, month, year)
--------F-2F8000DX0000-----------------------
INT 2F - FaxBIOS interface - INSTALLATION CHECK
    AX = 8000h
    DX = 0000h
    DI = 0000h
Return: AL = FFh if installed
    DX:DI -> signature "FaxBiosjpc"
Range:    AH=80h to AH=FFh, selected by scanning multiplex numbers for signature
SeeAlso: AH=2Ah,AX=80FBh
--------N-2F8001-----------------------------
INT 2F - Nanosoft, Inc. TurboNET server - ???
    AX = 8001h
    DS:SI -> 16-byte buffer for ???
Return: AH = status
        00h successful
        01h error (TurboNET busy)
Note:    makes NetBIOS calls
--------t-2F8001-----------------------------
INT 2F - CS_TSR specification - GET HANDLE (TSR-SPECIFIC INSTALLATION CHECK)
    AX = 8001h
    DS:SI -> ASCIZ signature string for desired TSR (see #2103)
Return: BX = process handle or 0000h if specified TSR not installed
    ES:DI -> process block for TSR (see #2102) if BX<>0000h
Note:    A widely-available copy of ASCII billing itself as "ASCII 2.OO by
      Nick Zaikin Jr." is in fact a hacked copy of the Compact Soft
      ASCII v4.23 which is identical except for the changed attribution
      and version (in fact, some instances of "4.23" were missed); the
      hacked copy requires the signature string
      "ASCII 2.OO by Nick Zaikin Jr." instead of the unhacked version's
      simple signature "ASCII"
SeeAlso: AX=8000h"CS_TSR",AX=8002h"CS_TSR"

(Table 2103)
Values for CS_TSR signature strings:
 "ASCII"    ASCII, a popup ASCII table with character input
 "Halculator"    HALC, a 32-bit RPN WYSIWIH calculator with undo and ptr support
 "AntiTurbo"    AT!, an intelligent system slow-down utility
--------t-2F8002-----------------------------
INT 2F - CS_TSR specification - GET PROCESS BLOCK BY PROCESS HANDLE
    AX = 8002h
    BX = process handle for TSR (see AX=8001h"CS_TSR")
Return: ES:DI -> process block for specified TSR (see #2102)
        unchanged if no match for process handle
Note:    This function is used to allocate a process handle when the TSR
      installs itself, by setting ES:DI to point at something other than
      a CS_TSR process block's signature string and iterating through the
      possible process handles (0001h to FFFFh) until ES:DI is returned
      unchanged
SeeAlso: AX=8000h"CS_TSR",AX=8001h"CS_TSR",AX=8003h"CS_TSR"
--------t-2F8003-----------------------------
INT 2F - CS_TSR specification - CUSTOM SUBFUNCTION
    AX = 8003h
    BX = process handle for TSR (see AX=8001h"CS_TSR")
    other registers vary by TSR
Return: vary by TSR, unchanged if not supported
Program: the CS_TSR specification is a standardized TSR interface by Compact
      Soft group in Kiev, Ukraine
SeeAlso: AX=8000h"CS_TSR",AX=8001h"CS_TSR",AX=8002h"CS_TSR"
--------F-2F80FB-----------------------------
INT 2F - FaxBIOS interface - COMMAND SUBMISSION
    AX = 80FBh
    BX = function number (see #2104)
    DX:DI -> command buffer
          (see #2106,#2109,#2110,#2111,#2112,#2113,#2118,#2124,#2131)
Return: AL = FFh if submitted OK
    CX = result code (see #2105)
Range:    AH=80h to AH=FFh, selected by scanning multiplex numbers for signature
SeeAlso: AX=8000h"FaxBIOS",AX=CBDDh

(Table 2104)
Values for FaxBIOS function number:
 0001h    SYS_LOGIN
 0002h    SYS_LOGOUT
 0003h    SYS_GET_FAXAPP_INFO
 0004h    STAT_IO_GET
 0005h    STAT_FAXBIOS_GET
 0006h    PDIR_OPEN
 0007h    PDIR_CLOSE (see #2114)
 0008h    PDIR_READ_PERSON (see #2115)
 0009h    PDIR_PARTIAL_READ
 000Ah    PDIR_READ_GROUP
 000Bh    PDIR_READ_MEMBER_LIST
 000Ch    PDIR_WRITE_PERSON
 000Dh    PDIR_WRITE_GROUP
 000Eh    PDIR_DELETE_PERSON
 000Fh    PDIR_DELETE_GROUP
 0010h    PDIR_READ_GROUP_LIST
 0011h    PDIR_IN_GROUP
 0012h    PDIR_OUT_GROUP
 0013h    SCHED_OPEN (see #2116)
 0014h    SCHED_ADD_DEST (see #2117)
 0015h    SCHED_ADD_FILE (see #2118)
 0016h    SCHED_SET_PARAMS (see #2119)
 0017h    SCHED_CANCEL (see #2116)
 0018h    SCHED_CLOSE (see #2120)
 0019h    SLOG_OPEN (see #2121)
 001Ah    SLOG_CLOSE (see #2121)
 001Bh    SLOG_SHORT_ENV_STAT
 001Ch    SLOG_LONG_ENV_STAT
 001Dh    SLOG_DEST_STAT
 001Eh    SLOG_FILE_STAT
 001Fh    SLOG_CANCEL_ENV
 0020h    RLOG_OPEN (see #2121)
 0021h    RLOG_CLOSE (see #2121)
 0022h    RLOG_READ
 0023h    GRAPH_GET_FILE_TYPE (see #2122)
 0024h    GRAPH_EXPORT_FILE
 0025h    GRAPH_GET_LAYOUT_INFO
 0026h    GRAPH_CREATE_FILE (see #2123)
 0027h    GRAPH_CLOSE_FILE (see #2124)
 0028h    GRAPH_CREATE_PAGE (see #2125)
 0029h    GRAPH_WRITE (see #2126)
 002Ah    GRAPH_END_PAGE
 002Bh    GRAPH_OPEN_FILE (see #2127)
 002Ch    GRAPH_GOTO_PAGE (see #2128)
 002Dh    GRAPH_READ (see #2129)
 002Eh    IOCTL_GET
 002Fh    IOCTL_SET
 0030h    IOCTL_ANSWER_FAX (see #2130)
 0031h    IOCTL_DIAL (see #2131)

(Table 2105)
Values for FaxBIOS result code:
 0000h    successful
 0001h    not prepared or servicing another client (busy)
 0002h    call failed due to sharing (LOCKED)
 0003h    logged-in client limit reached (FULL)
 0004h    transport denied (TRANSPORT_DENIED)
 0005h    not implemented (NOT_IMPLEMENTED)
 0006h    aborted while in progress (ABORTED)
 0007h    permissions denied (PERMISSION_DENIED)
 0008h    requested data is no longer valid (NO_LONGER_VALID)
 0080h    unspecified system error occurred
 0081h    an internal file was not found
 0082h    an internal file could not be created
 0083h    an internal file could not be opened
 0084h    an internal file could not be closed
 0085h    error occurred writing to an internal file
 0086h    error occurred reading from an internal file
 0087h    bad or corrupted file encountered
 0088h    an access violation occurred
 0089h    an internal file is empty
 008Ah    insufficient memory to process request
 008Bh    FaxBIOS was unable to issue a handle
 008Ch    an error internal to FaxBIOS occurred
 008Dh    no room on disk
 0100h    unspecified error accessing client file
 0101h    file not found
 0102h    creation fault
 0103h    open fault
 0104h    close fault
 0105h    write fault
 0106h    read fault
 0107h    file corrupted
 0108h    access violation
 0109h    empty file
 0200h    unspecified argument error
 0201h    bad function
 0202h    bad option
 0203h    bad structure size
 0204h    bad buffer size
 0205h    bad client ID
 0300h    unspecified error with token
 0301h    cover sheet token was invalid
 0302h    logo token was invalid
 0303h    signature token was invalid
 0304h    font token was invalid
 0305h    phone directory token was invalid
 0306h    outbound route token was invalid
 0307h    priority token was invalid
 0308h    sort token was invalid
 0309h    billing token was invalid
 0400h    unspecified handle error
 0401h    bad Phone Directory handle
 0402h    bad scheduling handle
 0403h    bad read send log handle
 0404h    bad read receive log handle
 0405h    bad graphics handle
 0500h    data passed in structure was invalid
 0501h    name field given is invalid
 0502h    phone number given is invalid
 0503h    poll code submitted is invalid
 0504h    file type constant was invalid
 0505h    BFT constant not defined or supported
 0506h    resolution not defined or supported
 0507h    page length not defined or supported
 0508h    page width not defined or supported
 0509h    date & time requested are ridiculous
 050Ah    Subject text was not an ASCIZ string
 050Bh    From text was not an ASCIZ string
 050Ch    requested envelope ID was not found
 050Dh    requested envelope ID is not valid
 050Eh    envelope requested was not found
 050Fh    destination index is out of range
 0510h    file index is out of range
 0511h    index into receive log is out of range
 0512h    file name specified was incomplete or invalid
 0513h    page selected was out of range
 0514h    bit width more than byte width
 0515h    mode for open is not defined
 0516h    person index is out of range
 0517h    person ID is out of range
 0518h    group index out of range or invalid
 0519h    group ID out of range or invalid
 051Ah    range of indices to read is invalid
 051Bh    group name given is invalid
 051Ch    field_to_use is badly specified
 051Dh    predicate invalid for field specified
 0600h    unspecified client procedure error
 0601h    device of interest is not present
 0602h    device of interest has been removed
 0603h    device of interest is not responding
 0604h    device of interest is disabled
 0605h    could not dial because device was in use
 0606h    maximum destination limit exceeded
 0607h    maximum file limit exceeded
 0608h    scheduling closed with no destination
 0609h    scheduling closed with no files or poll
 060Ah    scheduling closed with no parameters specified
 060Bh    file type specified does not match file
 060Ch    file type specified is not supported
 060Dh    file submitted is not exportable
 060Eh    file type specified is not imageable
 060Fh    error converting file
 0610h    envelope could not be cancelled
 0611h    Phone Directory is full
 0612h    record is already in the Phone Directory
 0613h    selected group in Phone Directory is full
 0614h    person is already in the group
 0615h    person is not in the group & cannot be removed
 0616h    a graphics file to be created already exists
 0617h    a graphics file to be read is empty
 0618h    GRAPH_CREATE_PAGE called before GRAPH_END_PAGE
 0619h    graph read or write attempted without goto or create
 061Ah    graph page contains no data
 061Bh    Phone Directory is already open for this client
 061Ch    schedule log is already open for this client
 061Dh    receive log is aready open for this client
 061Eh    Phone Directory function requires write mode
 0800h    denied exclusive use of the API

Format of FaxBIOS SYS_LOGIN command buffer:
Offset    Size    Description    (Table 2106)
 00h    WORD    structure size
 02h    WORD    function number
 04h    WORD    return code
 06h    WORD    client ID
 08h    WORD    API Major Version
 0Ah    WORD    API Minor Version
 0Ch    DWORD    reserved for manufacturer's use
 10h 22 BYTEs    manufacturer's ID
 26h    WORD    highest possible device number
 28h    WORD    maximum destinations per envelope
 2Ah    WORD    maximum files per envelope
 2Ch    WORD    FaxBIOS capabilities (see #2107)
 2Eh    DWORD    T.30 capabilities (see #2108)
 32h    WORD    IPC handle
 34h    DWORD    amount of memory needed to load
 38h    WORD    scope (00h for public, nonzero for private)
 3Ah  6 BYTEs    future expansion
 40h    WORD    structure size

Bitfields for FaxBIOS capabilities:
Bit(s)    Description    (Table 2107)
 0    transmit supported
 1    receive supported
 2    IOCTL supported
 3    IOCTL_DIAL supported
 4    IOCTL_ANSWER_FAX supported
 5    manual transmit supported
 6    optional phone services supported
 7    canonical phone objects
 8    seam with next supported

Bitfields for T.30 capabilities:
Bit(s)    Description    (Table 2108)
 0    low vertical resolution (minimum)
 1    high vertical resolution
 2    page width 107mm (4.21 in)
 3    page width 151mm (5.91 in)
 4    page width 215mm (8.46 in) (minimum)
 5    page width 255mm (10.04 in)
 6    page width 303mm (11.93 in)
 7    unused
 8    page length 297mm (11.69 in) (minimum)
 9    page length 364mm (14.33 in)
 10    page length 279mm (11 in)
 11    page length unlimited
 12    Group 4 resolution 300x300
 13    Group 4 resolution 400x400
 14    able to respond to poll from remote
 15    able to poll remote
 16    binary file transfer supported

Format of FaxBIOS SYS_LOGOUT command buffer:
Offset    Size    Description    (Table 2109)
 00h    WORD    structure size
 02h    WORD    function number
 04h    WORD    return code
 06h    WORD    client ID
 08h    DWORD    client tag (for client's internal use)
 0Ch  6 BYTEs    future expansion
 12h    WORD    structure size

Format of FaxBIOS SYS_GET_FAXAPP_INFO command buffer:
Offset    Size    Description    (Table 2110)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch 80 BYTEs    FaxBIOS data
 5Ch 80 BYTEs    default cover
 ACh 80 BYTEs    default logo
 FCh 80 BYTEs    default signature
14Ch 80 BYTEs    default font 10
19Ch 80 BYTEs    default font 165
1ECh 80 BYTEs    default user font
23Ch 80 BYTEs    default Pdir
28Ch 80 BYTEs    default sort
2DCh 10 BYTEs    default bill
2E6h 10 BYTEs    default route
2F0h 40 BYTEs    default cover sheet form
318h 34 BYTEs    valid dial characters
33Ah  6 BYTEs    local country code
340h  6 BYTEs    local city or area code
346h  6 BYTEs    future expansion
34Ch    WORD    structure size

Format of FaxBIOS STAT_IO_GET command buffer:
Offset    Size    Description    (Table 2111)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    device number
 0Eh    WORD    current activity
 10h    WORD    number of rings (if ringing)
 12h    WORD    number of fascimiles transmitted
 14h    WORD    number of fascimiles received
 16h    WORD    status of last transmission
 18h    WORD    envelope number of last transmission
 1Ah    WORD    index of last destination in envelope
 1Ch    WORD    status of last reception
 1Eh    WORD    current page (if session in progress)
 20h 80 BYTEs    current file
 70h 104 BYTEs    remote number
 D8h 20 BYTEs    last name
 ECh 20 BYTEs    first name
100h 32 BYTEs    company name
120h 32 BYTEs    notes
140h    WORD    current envelope ID (if sending)
142h    WORD    total pages in transmission (if sending)
144h  6 BYTEs    future expansion
14h    WORD    structure size

Format of FaxBIOS STAT_FAXBIOS_GET command buffer:
Offset    Size    Description    (Table 2112)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    status ID
 0Eh    WORD    currenty FaxBIOS function number
 10h    WORD    current Client ID being serviced
 12h    WORD    number of things to do
 14h    WORD    number of them done
 16h    WORD    number of pages to do (if any)
 18h    WORD    number of them done
 1Ah    WORD    number of files to do
 1Ch    WORD    number of them done
 1Eh 80 BYTEs    current File
 6Eh    WORD    0 if all devices are idle
 70h    WORD    number of fascimiles transmitted
 72h    WORD    number of fascimiles received
 74h    WORD    status of last transmission in system
 76h    WORD    envelope ID of last transmission
 78h    WORD    index of last destination in envelope
 7Ah    WORD    status of last reception in system
 7Ch    DWORD    time of next transmission
 80h  6 BYTEs    future expansion
 86h    WORD    structure size

Format of FaxBIOS PDIR_OPEN command buffer:
Offset    Size    Description    (Table 2113)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch 80 BYTEs    Phone Directory token
 5Ch 80 BYTEs    sort order token
 ACh    WORD    open Mode (0 = read, 1 = write)
 AEh    WORD    Phone Directory handle
 B0h    WORD    number of people
 B2h    WORD    number of groups
 B4h    WORD    bitmap of fields supported by partial read
 B6h  6 BYTEs    future expansion
 BCh    WORD    structure size

Format of FaxBIOS PDIR_CLOSE command buffer:
Offset    Size    Description    (Table 2114)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    Phone Directory handle
 0Eh  6 BYTEs    future expansion
 14h    WORD    structure size

Format of FaxBIOS PDIR_READ_PERSON command buffer:
Offset    Size    Description    (Table 2115)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    Phone Directory handle
 0Eh    WORD    retrieve by index
 10h    WORD    person ID or index
 12h    WORD    how many groups person is in
 14h    WORD    person ID
 16h 20 BYTEs    last name
 2Ah 20 BYTEs    first name
 3Eh 32 BYTEs    company
 5Eh 32 BYTEs    notes
 7Eh  6 BYTEs    FAX country code
 84h  6 BYTEs    FAX city/area code
 8Ah 14 BYTEs    FAX local number
 98h 14 BYTEs    FAX extension
 A6h 24 BYTEs    reserved
 BEh  6 BYTEs    voice country code
 C4h  6 BYTEs    voice city/area code
 CAh 14 BYTEs    voice local number
 D8h 14 BYTEs    voice extension
 E6h 24 BYTEs    reserved
 FEh 10 BYTEs    outbound routing information
108h 10 BYTEs    billing information, credit card etc
112h    DWORD    remote FAX capabilities
116h 21 BYTEs    T.30 poll code of FAX number
12Bh 15 BYTEs    reserved
13Ah  6 BYTEs    future expansion
140h    WORD    structure size

Format of FaxBIOS SCHED_OPEN, SCHED_CANCEL command buffer:
Offset    Size    Description    (Table 2116)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    scheduler handle
 0Eh  6 BYTEs    future expansion
 14h    WORD    structure size

Format of FaxBIOS SCHED_ADD_DEST command buffer:
Offset    Size    Description    (Table 2117)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    schedule handle
 0Eh    WORD    device number if manual send wanted
 10h    WORD    non-zero if poll desired
 12h    WORD    person ID
 14h 20 BYTEs    last name
 28h 20 BYTEs    first name
 3Ch 32 BYTEs    company
 5Ch 32 BYTEs    notes
 7Ch  6 BYTEs    FAX country code
 82h  6 BYTEs    FAX city/area code
 88h 14 BYTEs    FAX local number
 96h 14 BYTEs    FAX extension
 A4h 24 BYTEs    reserved
 BCh  6 BYTEs    voice country code
 C2h  6 BYTEs    voice city/area code
 C8h 14 BYTEs    voice local number
 D6h 14 BYTEs    voice extension
 E4h 24 BYTEs    reserved
 FCh 10 BYTEs    outbound routing information
106h 10 BYTEs    billing information, credit card etc
110h    DWORD    remote FAX capabilities
114h 21 BYTEs    T.30 poll code of FAX number
129h 15 BYTEs    reserved
138h  6 BYTEs    future expansion
13Eh    WORD    structure size
SeeAlso: #2118

Format of FaxBIOS SCHED_ADD_FILE command buffer:
Offset    Size    Description    (Table 2118)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    schedule handle
 0Eh    WORD    file type
        0000h unidentified
        0001h native file format
        0002h ASCII
        0003h FaxBIOS Tiff Class F
 10h 80 BYTEs    file name
 60h 80 BYTEs    font token
 B0h    WORD    conversion options bitmap
 B2h    WORD    resolution
        0000h standard 98 lines per inch, 204 dpi
        0001h fine 196 lines per inch, 204 dpi
        0002h Group4 300 dpi
        0003h Group4 400 dpi
 B4h    WORD    page length
        0000h 279 mm (11 in)
        0001h 297 mm (11.69 in)
        0002h 364 mm (14.33 in)
        0003h unlimited
 B6h    WORD    page width
        0000h 215 mm (8.46 in)
        0001h 255 mm (10.04 in)
        0002h 303 mm (11.93 in)
        0003h 151 mm (5.91 in)
        0004h 107 mm (4.21 in)
 B8h    WORD    binary file transfer specification
        0000h only as FAX
        0001h only as file (for non-faxable files)
        0002h as file when possible else FAX
 BAh    WORD    seam flag (nonzero for seam with next)
 BCh    WORD    delete flag (nonzero to delete when done)
 BEh  6 BYTEs    future expansion
 C4h    WORD    structure size
SeeAlso: #2117,#2119

Format of FaxBIOS SCHED_SET_PARAMS command buffer:
Offset    Size    Description    (Table 2119)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    scheduler handle
 0Eh    DWORD    time to send
 10h 10 BYTEs    priority token
 1Ch 80 BYTEs    logo file token
 6Ch 80 BYTEs    signature file token
 BCh 80 BYTEs    cover page token
10Ch 40 BYTEs    Subject text
134h 40 BYTEs    From text
15Ch    WORD    user ID
15Eh  6 BYTEs    future expansion
164h    WORD    structure size
SeeAlso: #2117,#2118,#2120

Format of FaxBIOS SCHED_CLOSE command buffer:
Offset    Size    Description    (Table 2120)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    scheduler handle
 0Eh    WORD    envelope ID generated
 10h  6 BYTEs    future expansion
 16h    WORD    structure size
SeeAlso: #2119

Format of FaxBIOS SLOG_OPEN, SLOG_CLOSE, RLOG_OPEN, RLOG_CLOSE command buffer:
Offset    Size    Description    (Table 2121)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    log handle
 0Eh    WORD    number of entries
 10h  6 BYTEs    future expansion
 16h    WORD    structure size

Format of FaxBIOS GRAPH_GET_FILE_TYPE command buffer:
Offset    Size    Description    (Table 2122)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch 80 BYTEs    filename
 5Ch    WORD    file type
        0000h unidentified
        0001h native file format
        0002h ASCII
        0003h FaxBIOS Tiff Class F
 5Eh    WORD    bitmap of supported capabilities
 60h  6 BYTEs    future expansion
 66h    WORD    structure size
SeeAlso: #2123,#2124

Format of FaxBIOS GRAPH_CREATE_FILE command buffer:
Offset    Size    Description    (Table 2123)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch 80 BYTEs    filename
 5Ch    WORD    graph handle
 5Eh  6 BYTEs    future expansion
 64h    WORD    structure size
SeeAlso: #2122,#2124,#2125

Format of FaxBIOS GRAPH_CLOSE_FILE, GRAPH_END_PAGE command buffer:
Offset    Size    Description    (Table 2124)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    graph handle
 0Eh  6 BYTEs    future expansion
 14h    WORD    structure size
SeeAlso: #2123,#2125

Format of FaxBIOS GRAPH_CREATE_PAGE command buffer:
Offset    Size    Description    (Table 2125)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    graph handle
 0Eh    WORD    resolution
 10h    WORD    page width
 12h  6 BYTEs    future expansion
 18h    WORD    structure size
SeeAlso: #2123,#2124,#2126

Format of FaxBIOS GRAPH_WRITE_PAGE command buffer:
Offset    Size    Description    (Table 2126)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    graph handle
 0Eh    DWORD    pointer to storage for image
 12h    WORD    band height in lines
 14h    WORD    width of page image in bytes
 16h    WORD    facsimile page width constant
 18h    WORD    width of page image in bits
 1Ah    WORD    number of bytes actually processed
 1Ch  6 BYTEs    future expansion
 22h    WORD    structure size
SeeAlso: #2125,#2127

Format of FaxBIOS GRAPH_OPEN_FILE command buffer:
Offset    Size    Description    (Table 2127)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch 80 BYTEs    filename
 5Ch    WORD    file type
 5Eh    WORD    graph handle
 60h    WORD    number of pages
 62h  6 BYTEs    future expansion
 68h    WORD    structure size
SeeAlso: #2126,#2128

Format of FaxBIOS GRAPH_GOTO_PAGE command buffer:
Offset    Size    Description    (Table 2128)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    graph handle
 0Eh    WORD    page number
 10h    WORD    vertical resolution
 12h    WORD    page width
 14h    DWORD    page length
 18h  6 BYTEs    future expansion
 1Eh    WORD    structure size
SeeAlso: #2126,#2127,#2129

Format of FaxBIOS GRAPH_READ_PAGE command buffer:
Offset    Size    Description    (Table 2129)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    graph handle
 0Eh    DWORD    pointer to storage for image
 12h    WORD    band height in lines
 14h    WORD    width of page image in bytes
 16h    WORD    facsimile page width constant
 18h    WORD    width of page image in bits
 1Ah    WORD    number of bytes actually processed
 1Ch  6 BYTEs    future expansion
 22h    WORD    structure size

Format of FaxBIOS IOCTL_ANSWER_FAX command buffer:
Offset    Size    Description    (Table 2130)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    device number
 0Eh  6 BYTEs    future expansion
 14h    WORD    structure size
SeeAlso: #2131

Format of FaxBIOS IOCTL_DIAL command buffer:
Offset    Size    Description    (Table 2131)
 00h 12 BYTEs    common data (see SYS_LOGOUT above)
 0Ch    WORD    device number
 0Eh  6 BYTEs    country code
 14h  6 BYTEs    city or area code
 1Ah 14 BYTEs    local number
 28h 14 BYTEs    extension
 36h 14 BYTEs    reserved
 4Eh  6 BYTEs    future expansion
 54h    WORD    structure size
SeeAlso: #2130
--------N-2F8100-----------------------------
INT 2F U - Nanosoft, Inc. TurboNET redirector - INSTALLATION CHECK
    AX = 8100h
Return: AL = FFh if installed
Program: TurboNET is a NetBIOS-based file redirector and server; a
      demonstration version may be downloaded from Nanosoft's BBS
SeeAlso: AX=8000h"TurboNET"
--------N-2F8101-----------------------------
INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
    AX = 8101h
Return: AL = ???
    DL = ???
--------N-2F8102-----------------------------
INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
    AX = 8102h
Return: AL = ???
    DL = ???
--------N-2F8103-----------------------------
INT 2F U - Nanosoft, Inc. TurboNET redirector - GET MACHINE NAME???
    AX = 8103h
    ES:DI -> 17-byte buffer
Return: buffer filled
--------N-2F8104-----------------------------
INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
    AX = 8104h
    BL = ???
    BH = ???
    CX = ???
    DX = ???
    DS:SI -> 16-byte buffer containing ???
Return: AL = 00h ???
--------N-2F8105-----------------------------
INT 2F U - Nanosoft, Inc. TurboNET redirector - ???
    AX = 8105h
    CX = ??? (don't change current value if 0000h)
    DX = ??? (don't change current value if 0000h)
Return: AL = 00h successful
--------s-2F8200-----------------------------
INT 2F - RESPLAY - SAMPLE/PLAYBACK
    AX = 8200h
    DX:DI -> start of sample space
    CX:BX = length in bytes
Return: AX = status (see #2132)
Program: RESPLAY is a freeware sound sampling/playback utility by Mark J. Cox
SeeAlso: AX=8201h"RESPLAY",AX=8210h

(Table 2132)
Values for RESPLAY status:
 1000h    successful
 2000h    not initialized (see AX=8210h)
 other    RESPLAY not installed
--------G-2F8200-----------------------------
INT 2F U - Nanosoft, Inc. CAPDOS - INSTALLATION CHECK
    AX = 8200h
Return: AL = FFh if installed
Program: CAPDOS is a TSR by Nanosoft, Inc. which allows INT 21h calls to be
      captured and recorded for later analysis
SeeAlso: AX=8100h,AX=8201h"CAPDOS",AX=8202h"CAPDOS",AX=8203h"CAPDOS"
SeeAlso: AX=8204h"CAPDOS"
--------s-2F8201-----------------------------
INT 2F - RESPLAY - INSTALLATION CHECK
    AX = 8201h
Return: AX = 7746h if installed
SeeAlso: AX=8202h"RESPLAY",AX=8210h
--------G-2F8201-----------------------------
INT 2F - Nanosoft, Inc. CAPDOS - CLEAR QUEUE
    AX = 8201h
Note:    resets queue of captured INT 21 calls
SeeAlso: AX=8200h"CAPDOS"
--------s-2F8202-----------------------------
INT 2F - RESPLAY - UNINSTALL
    AX = 8202h
Return: AX = status
        1000h successful
SeeAlso: AX=8201h"RESPLAY",AX=8210h"RESPLAY"
--------G-2F8202-----------------------------
INT 2F - Nanosoft, Inc. CAPDOS - START COLLECTION
    AX = 8202h
SeeAlso: AX=8200h"CAPDOS",AX=8203h"CAPDOS"
--------G-2F8203-----------------------------
INT 2F - Nanosoft, Inc. CAPDOS - STOP COLLECTION
    AX = 8203h
SeeAlso: AX=8200h"CAPDOS",AX=8202h"CAPDOS",AX=8204h"CAPDOS"
--------G-2F8204-----------------------------
INT 2F - Nanosoft, Inc. CAPDOS - GET QUEUE PARAMETERS
    AX = 8204h
Return: AH = flag: queue wrapped if nonzero
    BX = index of current start of queue
    CX = size of queue in entries
SeeAlso: AX=8200h"CAPDOS",AX=8202h"CAPDOS",AX=8205h"CAPDOS"
--------G-2F8205-----------------------------
INT 2F - Nanosoft, Inc. CAPDOS - GET QUEUE ITEM
    AX = 8205h
    BX = queue item number
Return: AX,BX,CX,DX,SI,DI,DS,ES as on entry to captured DOS call
SeeAlso: AX=8200h"CAPDOS",AX=8204h"CAPDOS"
--------s-2F8210-----------------------------
INT 2F - RESPLAY - INITIALIZE
    AX = 8210h
    BL = sound device number (see #2133)
    BH = sample rate in multiples of 250 Hz (14h to A0h)
    CL = direction
        00h playback
        01h sample
Return: AX = status (see #2132)
SeeAlso: AX=8200h"RESPLAY"

(Table 2133)
Values for RESPLAY sound device:
 00h    printer port LPT1
 01h    printer port LPT2
 02h    prototype board at I/O address 0300h
 03h    printer port (alternative LPT1)
 04h    internal speaker
----------2F86-------------------------------
INT 2F U - ???
    AH = 86h
    AL = function (at least 06h and 07h)
    ???
Return: ???
Note:    called by Codeview for Windows
SeeAlso: AH=44h
--------U-2F8900-----------------------------
INT 2F - WHOA!.COM - INSTALLATION CHECK
    AX = 8900h
Return: AL = state
        00h not installed
        FFh installed
Program: WHOA!.COM is a system slow-down utility by Brad D Crandall
SeeAlso: AX=8901h,AX=8902h
--------U-2F8901-----------------------------
INT 2F - WHOA!.COM - UNINSTALL
    AX = 8901h
Return: AL = status
        FDh successful
        FEh error
SeeAlso: AX=8900h
--------U-2F8902-----------------------------
INT 2F - WHOA!.COM - SET DELAY COUNT
    AX = 8902h
    BX = delay count (larger values slow system down more)
Return: AL = status
        FDh successful
        FEh error
Program: WHOA!.COM is a system slow-down utility by Brad D Crandall
SeeAlso: AX=8900h
--------U-2F9000-----------------------------
INT 2F U - RAID - INSTALLATION CHECK
    AX = 9000h
Return: AL = FFh if installed
Program: RAID (Resident AID) is a TSR utility program by Ross Neilson Wentworth
      that resides mostly in EMS
--------U-2F9001-----------------------------
INT 2F U - RAID - GET ???
    AX = 9001h
Return: DX:AX -> ???
SeeAlso: AX=9000h
--------U-2F9002-----------------------------
INT 2F U - RAID - GET RESIDENT SEGMENT
    AX = 9002h
Return: AX = segment of resident (conventional memory) portion
SeeAlso: AX=9000h
--------U-2F9003-----------------------------
INT 2F U - RAID - UNINSTALL
    AX = 9003h
Return: ???
SeeAlso: AX=9000h
--------U-2F9004-----------------------------
INT 2F U - RAID - GET ???
    AX = 9004h
Return: AX = first available paragraph past end of resident portion???
    CX destroyed
SeeAlso: AX=9000h
--------e-2F92-------------------------------
INT 2F - Network Courier E-Mail - API
    AH = 92h
    AL = function
        00h installation check
        01h uninstall
        02h pop down MICRO.EXE notification window
        03h ???
        04h ???
        05h ???
Return: ???
Program: The Network Courier is an electronic mail package by Consumers
      Software of Vancouver, BC which was bought by Microsoft in 1991 and
      renamed Microsoft Mail v3.0.
SeeAlso: AX=9400h,AX=9401h,AX=9402h,AH=9Ch
Index:    installation check;Network Courier E-Mail
Index:    uninstall;Network Courier E-Mail
--------R-2F9200-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - BUG
    AX = 9200h
Program: DRIVEMAP is a redirector which allows drives on computers connected
      over the parallel or serial ports to appear as local drives
BUG:    jumps to data because jump table entry is 0000h
Note:    DRIVEMAP returns AX=FFFFh if not a valid function number in AL
--------R-2F9201-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - CHECK IF MAPPED DRIVE
    AX = 9201h
    DL = drive number (01h = A:, etc.)
Return: AL = 92h if mapped drive
    AH may be destroyed (v8.0 DRIVEMAP returns AX=0000h if not mapped)
SeeAlso: AX=9204h,AX=920Bh
--------R-2F9202-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - UNINSTALL
    AX = 9202h
    BX = caller's CS
Return: AX = status
        0000h failed
        nonzero successful
SeeAlso: AX=9204h
--------R-2F9203-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET VERSION
    AX = 9203h
Return: AH = major version
    AL = minor version
    CX = segment of resident code
Note:    the DRIVEMAP included with PC Tools v8.0 is version 1.00
SeeAlso: AX=9204h,INT 16/AX=FF70h
--------R-2F9204-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - INSTALLATION CHECK
    AX = 9204h
Return: AX = 9200h if installed
       BL = ???
       CX = segment of resident code
Program: DRIVEMAP is a redirector which allows drives on computers connected
      over the parallel or serial ports to appear as local drives
SeeAlso: AX=9201h,AX=9202h,AX=9203h
--------R-2F9205-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - SET ???
    AX = 9205h
    BX = ??? to set
Return: CX = new value of ???
--------R-2F9206-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9206h
    ???
Return: ???
--------R-2F9207-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET ???
    AX = 9207h
    ???
Return: AX = ???
--------R-2F9208-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9208h
    ???
Return: ???
--------R-2F9209-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9209h
    ???
Return: AX = ???
    BX = ???
    CX = ???
    DX = ???
--------R-2F920A-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 920Ah
    BX = ???
Return: AX = ??? or FFFBh on error
--------R-2F920B-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - SET DRIVE MAPPING
    AX = 920Bh
    BL = drive letter (41h ['A'] = A:, etc)
    CX = ??? (0000h removes mapping)
Return: AX = ??? or FFF8h on error
SeeAlso: AX=9201h,AX=920Dh
--------R-2F920C-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 920Ch
    ???
Return: AX = ??? (0002h)
    CX = ??? (0000h)
--------R-2F920D-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET DRIVE TYPE
    AX = 920Dh
    BL = drive letter (41h ['A'] = A:, etc)
Return: AX = type flags
        bit 0: ???
        bit 1: available
        bit 5: local
    BX = ???
    CX = segment of resident code (apparently an unintended side effect)
Program: DRIVEMAP is a redirector which allows drives on computers connected
      over the parallel or serial ports to appear as local drives
SeeAlso: AX=9218h,INT 16/AX=FF70h
--------R-2F920E-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - SET LPT MAPPING
    AX = 920Eh
    BX = port number (0-2)
    CX = ??? (0000h to unmap)
Return: ???
--------R-2F920F-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET ???
    AX = 920Fh
    ES:DI -> 3-byte buffer for ???
Return: CX = 0000h
    ES:DI buffer filled
--------R-2F9210-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9210h
    ???
Return: ???
--------R-2F9211-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET ???
    AX = 9211h
    ES:DI -> 8-word buffer for ???
Return: CX = 0000h
    ES:DI buffer filled
--------R-2F9212-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - CRITICAL SECTION???
    AX = 9212h
    BX = phase
        0000h leave critical section???
        nonzero enter critical section???
--------R-2F9213-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9213h
    BX = function number (0000h-000Bh)
    ???
Return: ???
--------R-2F9214-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET ???
    AX = 9214h
    ES:DI -> 6-word buffer for ???
Return: CX = 0000h
    AX = ???
    ES:DI buffer filled
--------R-2F9215-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET ???
    AX = 9215h
    ES:DI -> 100-word buffer for ???
Return: CX = 0000h
    ES:DI buffer filled
--------R-2F9216-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9216h
    ES:DI -> ???
Return: ???
--------R-2F9217-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9217h
    DS:SI -> 25-word buffer containing ???
Return: ???
--------R-2F9218-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET LPT TYPE???
    AX = 9218h
    BX = port number???
Return: AX = ???
    BX = ??? (0000h)
    CX = ??? (0000h)
Program: DRIVEMAP is a redirector which allows drives on computers connected
      over the parallel or serial ports to appear as local drives
--------R-2F9219-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 9219h
    ???
Return: ???
--------R-2F921A-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 921Ah
    ???
Return: AH = ???
    AL = ???
    BX = ???
--------R-2F921B-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 921Bh
    ???
Return: AX = ???
    CX = segment of resident code (apparently an unintended side effect)
--------R-2F921C-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 921Ch
    ???
Return: ???
--------R-2F921D-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - GET ???
    AX = 921Dh
Return: AX = ???
--------R-2F921E-----------------------------
INT 2F U - PC Tools v8.0 DRIVEMAP - ???
    AX = 921Eh
    ???
Return: ???
Program: DRIVEMAP is a redirector which allows drives on computers connected
      over the parallel or serial ports to appear as local drives
Note:    this function sets two variables to 24h each
SeeAlso: INT 16/AX=FF70h
--------V-2F93-------------------------------
INT 2F - InnerMission v1.7+ - INSTALLATION CHECK
    AH = 93h
    BX = CX = AX
Return: AL = state
        FFh if installed and BX=CX=AX on entry
        BX = segment of resident code
        01h if installed but BX or CX differ from AX (multiplex number not
          available)
Program: InnerMission is a shareware graphical screen blanker by Kevin Stokes
SeeAlso: INT 14/AX=AA01h,INT 2F/AX=6400h
Index:    screen saver;InnerMission
--------e-2F9400-----------------------------
INT 2F - MICRO.EXE - INSTALLATION CHECK
    AX = 9400h
Return: AL = 07h or 08h if installed
Program: MICRO.EXE is a TSR of the Microsoft Mail part of Workgroup Connection
SeeAlso: AH=92h"Network Courier",AX=9401h,AX=9402h,AX=9403h,AX=9404h
SeeAlso: INT 21/AH=3Fh"WORKGRP.SYS"
--------e-2F9401-----------------------------
INT 2F - MICRO.EXE - SET ??? FLAG
    AX = 9401h
SeeAlso: AX=9400h,AX=9403h
--------e-2F9402-----------------------------
INT 2F - MICRO.EXE - ???
    AX = 9402h
    ???
Return: ???
SeeAlso: AX=9400h
--------e-2F9403-----------------------------
INT 2F - MICRO.EXE - SET ??? FLAG
    AX = 9403h
SeeAlso: AX=9400h,AX=9404h
--------e-2F9404-----------------------------
INT 2F - MICRO.EXE - CLEAR ??? FLAG
    AX = 9404h
    ES:DI -> name of executable from which MICRO.EXE was started
Note:    if the specified name is identical to the name of the program file
      from which MICRO was started, the ??? flag is cleared; otherwise,
      it is left unchanged
SeeAlso: AX=9400h,AX=9403h
--------V-2F96C7-----------------------------
INT 2F U - STRETCH - INSTALLATION CHECK
    AX = 96C7h
Return: AX = AAAAh if installed
Program: stretch.exe is a TSR for Toshiba Laptops to avoid blank screen areas
      in VGA text modes by increasing inter-line spacing
--------e-2F9C-------------------------------
INT 2F - Network Courier E-Mail OPERATOR.EXE - API
    AH = 9Ch
    AL = subfunction
        01h uninstall
Return: ???
Program: The Network Courier is an electronic mail package by Consumers
      Software of Vancouver, BC which was bought by Microsoft in 1991 and
      renamed Microsoft Mail v3.0.
SeeAlso: AH=92h
Index:    uninstall;Network Courier E-Mail OPERATOR.EXE
--------G-2F9E00-----------------------------
INT 2F U - INTMON v2.1 - INSTALLATION CHECK
    AX = 9E00h
Return: AX = FFFFh if installed
        BX = segment of resident code
Program: INTMON is a shareware interactive interrupt monitoring TSR for 386
      and higher machines by Celso Minnitti, Jr.
SeeAlso: AX=9E01h,AX=9E02h,AX=9E03h,AX=9F00h
--------G-2F9E01-----------------------------
INT 2F U - INTMON v2.1 - RESET
    AX = 9E01h
Return: ???
Desc:    this function specifies that INTMON should assume that any interrupts
      on which it is currently awaiting a return have completed (i.e.
      interrupts which never return such as INT 20 and INT 27)
SeeAlso: AX=9E00h,AX=9E03h
--------G-2F9E02-----------------------------
INT 2F U - INTMON v2.1 - DISPLAY CPU REGISTERS???
    AX = 9E02h
Return: ???
SeeAlso: AX=9E00h
--------G-2F9E03-----------------------------
INT 2F U - INTMON v2.1 - HOOK INTERRUPT???
    AX = 9E03h
    BH = interrupt number???
Return: ???
Note:    if AL > 03h on entry, INTMON 2.1 returns immediately
SeeAlso: AX=9E00h,AX=9E01h
--------G-2F9F00-----------------------------
INT 2F U - INTCFG v2.1 - INSTALLATION CHECK
    AX = 9F00h
Return: AX = FFFFh if installed
Program: INTCFG is an optionally-resident control program for INTMON by Celso
      Minnitti, Jr.
SeeAlso: AX=9E00h,AX=9F01h,AX=9F30h,AX=9F49h
--------G-2F9F01-----------------------------
INT 2F U - INTCFG v2.1 - ???
    AX = 9F01h
    ???
Return: ???
SeeAlso: AX=9F00h
--------G-2F9F30-----------------------------
INT 2F U - INTCFG v2.1 - GET ???
    AX = 9F30h
Return: AX = ??? (0002h)
SeeAlso: AX=9F00h
--------G-2F9F49-----------------------------
INT 2F U - INTCFG v2.1 - UNINSTALL
    AX = 9F49h
Return: AX,DX,DS,ES destroyed
SeeAlso: AX=9F00h
--------E-2FA1--BX0081-----------------------
INT 2F - Ergo DOS extenders - INSTALLATION CHECK
    AH = A1h
    BX = 0081h
    AL = which
        FEh OS/286,OS/386
        FFh HummingBoard DOS extender
    ES:DI -> 16-byte buffer
Return: if installed, first four bytes of ES:DI buffer are "IABH"
Note:    since TKERNEL is a licensed version, it is likely that subfunctions
      BX=0082h and BX=0084h are present and function identically to the
      AX=FBA1h/BX=008xh calls
SeeAlso: AX=ED00h,AX=FBA1h/BX=0081h,INT 15/AX=BF02h
--------m-2FA189-----------------------------
INT 2F U - Biologic HRAMDEV.SYS - API
    AX = A189h
    BX = subfunction
        0000h set ???
        0001h remove ???
        0002h get status ???
        0003h enable ???
        0004h disable ???
        0005h set ??? flag
        0006h clear ??? flag
        0007h set ??? flag
        0008h clear ??? flag
        0009h set ???
    ES:DI -> function-specific arguments
        if func 0000h: 20-byte buffer containing ???
        if func 0001h: 20-byte buffer for returned ???
        if func 0002h: 16-byte buffer for returned ???
        if func 0009h: WORD containing ???
Return: BX = A189h if installed
    AH = status
        00h successful
        FFh failed or invalid function number
Program: HRAMDEV.SYS is a part of the shareware package HRAM by Biologic which
      provides improved high memory access under MS-DOS 5.0
Note:    functions 00h and 01h use a stack of four entries; function 01h always
      removes the values stored with the most recent function 00h call
      which has not yet been matched with a function 01h call.
--------U-2FA4E0-----------------------------
INT 2F - Futurus Team - INSTALLATION CHECK
    AX = A4E0h
Return: AL = 52h ("R") if installed
        AH = major version plus 30h ("0")
        ES:BX -> ??? (INT A4 handler???)
Note:    older versions of Right Hand Man (from which Team evolved) store the
      signature "RH" at offset 103h in the INT 2F handler's segment
SeeAlso: INT A4"Right Hand Man"
--------U-2FA900-----------------------------
INT 2F - METZTSR.COM - INSTALLATION CHECK
    AX = A900h
    CF set
Return: CF clear if resident
        AX = 97FFh
    CF set if not present
Notes:    METZTSR.COM prevents METZ applications (such as the MAGIC screen
      saver) inactivity timeout while running a DOSapp under MS Windows.
    the default multiplex number is A9h, but may be set to any value from
      80h to FFh with a commandline switch
SeeAlso: AX=A901h,AX=A902h
--------U-2FA901-----------------------------
INT 2F - METZTSR.COM - GET TIME OF LAST KEYBOARD ACTIVITY
    AX = A901h
    CF set
Return: CF clear if successful
        AX:DX = BIOS time at which INT 09 was last invoked
    CF set if not present
SeeAlso: INT 09,INT 1A/AH=00h
--------U-2FA902-----------------------------
INT 2F - METZTSR.COM - SET METZ Ctrl-Alt-Del FLAG
    AX = A902h
    BL = new value
        00h Ctrl-Alt-Del not allowed
        else Ctrl-Alt-Del allowed (startup default is 01h)
    CF set
Return: CF clear if successful
        AX = 97FFh
    CF set if not resident
SeeAlso: AX=A903h
--------U-2FA903-----------------------------
INT 2F - METZTSR.COM - GET METZ Ctrl-Alt-Del FLAG
    AX = A903h
    CF set
Return: CF clear if successful
        AX = 97FFh if Ctrl-Alt-Del allowed
        AX = 0000h if Ctrl-Alt-Del not allowed
    CF set if not resident
SeeAlso: AX=A902h
--------U-2FAA00-----------------------------
INT 2F - VIDCLOCK.COM - INSTALLATION CHECK
    AX = AA00h
Return: AL = 00h not installed
         FFh installed
Program: VIDCLOCK.COM is a memory-resident clock by Thomas G. Hanlin III
--------f-2FAB00-----------------------------
INT 2F - Btrieve Multi-User - INSTALLATION CHECK
    AX = AB00h
Return: AL = 4Dh if installed
SeeAlso: AX=AB01h,AX=AB02h,INT 7B"Btrieve"
----------2FAB00-----------------------------
INT 2F - SRSoft MODAL PC v2+ - INSTALLATION CHECK / GET VERSION
    AX = AB00h
Return: AX = 5253h ('SR' byte-swapped) if installed
        BX = MODAL PC version (BL = major, BH = minor)
Program: MODAL PC is an algorithm/real-system simulation package by SR Soft
      using Petri-nets to describe simulated objects
SeeAlso: AX=AB01h"MODAL",AX=AB02h"MODAL",AX=AB06h"MODAL"
--------f-2FAB01-----------------------------
INT 2F - Btrieve Multi-User - EXECUTE Btrieve OPERATION
    AX = AB01h
    BX = process ID
    DS:DX -> 38-byte parameter record (see #2967 at INT 7B"Btrieve")
Return: AL = status
        00h OK
        other retry after calling INT 7F/AX=0200h
SeeAlso: AX=AB00h"Btrieve",AX=AB02h"Btrieve",INT 7B"Btrieve",INT 7F/AX=0200h
----------2FAB01-----------------------------
INT 2F - SRSoft MODAL PC v2+ - GET PROCESS RUN PARAMETER
    AX = AB01h
Return: AX = 5253h ('SR' byte-swapped) if installed
    BL = run parameter
        00h normal process
        01h run with tracing enabled
        02h run initialization process (first thread of main task)
SeeAlso: AX=AB00h"MODAL",AX=AB02h"MODAL"
--------f-2FAB02-----------------------------
INT 2F - Btrieve Multi-User - GET NEW PROCESS ID
    AX = AB02h
Return: AL = 00h successful
        BX = process ID
    AL > 00h failed, retry after calling INT 7F/AX=0200h
SeeAlso: AX=AB00h,AX=AB01h,INT 7B"Btrieve",INT 7F/AX=0200h
----------2FAB02-----------------------------
INT 2F - SRSoft MODAL PC v2+ - SET PROCESS EXIT CODE
    AX = AB02h
    BL = exit code
Return: AX = 5253h ('SR' byte-swapped) if installed
SeeAlso: AX=AB00h"MODAL",AX=AB01h"MODAL",AX=AB03h"MODAL"
----------2FAB03-----------------------------
INT 2F - SRSoft MODAL PC v2+ - ALLOCATE COMMON MEMORY
    AX = AB03h
    BX = required size of common memory for variables/semaphores in bytes
Return: AX = 5253h ('SR' byte-swapped) if installed
SeeAlso: AX=AB00h"MODAL",AX=AB02h"MODAL",AX=AB04h"MODAL"
----------2FAB04-----------------------------
INT 2F - SRSoft MODAL PC v2+ - GET ALL COMMON VARIABLES AND SEMAPHORES
    AX = AB04h
    DS:DX -> buffer for common data
Return: AX = 5253h ('SR' byte-swapped) if installed
    CF clear if successful
    CF set on error
SeeAlso: AX=AB00h"MODAL",AX=AB03h"MODAL",AX=AB05h"MODAL",AX=AB06h,AX=AB07h
----------2FAB05-----------------------------
INT 2F - SRSoft MODAL PC v2+ - SET ALL COMMON VARIABLES AND SEMAPHORES
    AX = AB05h
    DS:DX -> buffer containing common data
Return: AX = 5253h ('SR' byte-swapped) if installed
    CF clear if successful
    CF set on error
SeeAlso: AX=AB00h"MODAL",AX=AB03h"MODAL",AX=AB04h"MODAL",AX=AB06h,AX=AB07h
----------2FAB06-----------------------------
INT 2F - SRSoft MODAL PC v2+ - GET A COMMON VARIABLE OR SEMAPHORE
    AX = AB06h
    BX = offset of variable or semaphore in common memory
    CX = variable/semaphore size in bytes
    DS:DX -> buffer for variable or semaphore
Return: AX = 5253h ('SR' byte-swapped) if installed
    CF clear if successful
    CF set on error
SeeAlso: AX=AB00h"MODAL",AX=AB04h,AX=AB05h,AX=AB07h
----------2FAB07-----------------------------
INT 2F - SRSoft MODAL PC v2+ - SET A COMMON VARIABLE OR SEMAPHORE
    AX = AB07h
    BX = offset of variable or semaphore in common memory
    CX = variable/semaphore size in bytes
    DS:DX -> buffer containing variable or semaphore
Return: AX = 5253h ('SR' byte-swapped) if installed
    CF clear if successful
    CF set on error
SeeAlso: AX=AB00h"MODAL",AX=AB04h,AX=AB05h,AX=AB06h
--------V-2FAC00-----------------------------
INT 2F - DOS 4.01+ GRAPHICS.COM - INSTALLATION CHECK
    AX = AC00h
Return: AX = FFFFh
    ES:DI -> ??? (graphics data?) (not documented)
Note:    this installation check was moved here to avoid the conflict with the
      CD-ROM extensions that occurred in DOS 4.00
SeeAlso: AX=1500h"GRAPHICS"
--------V-2FAC00DI1092-----------------------
INT 2F - QRIP/TSR - GIVE CPU TO QRIP
    AX = AC00h
    DI = 1092h
Return: nothing
Program: QRIP/TSR is a shareware TSR by Shane Hathaway implementing the Remote
      Imaging Protocol (RIP, RIPscrip) used by several BBS systems to
      provide a graphical user interface
Desc:    give QRIP some CPU time to update music and flashing timers
Notes:    if DI <> 1092h on entry, QRIP chains the call
    this function should be called regularly whenever the terminal program
      is otherwise idle; the updates are automatically performed on any
      other QRIP call
SeeAlso: AX=AC01h,AX=ACF0h
--------V-2FAC01DI1092-----------------------
INT 2F - QRIP/TSR - CHANGE INTERNAL FLAGS
    AX = AC01h
    DI = 1092h
    BX = flags to be turned on (see #2134)
    CX = flags to be turned off (see #2134)
Return: AX = 9142h if installed
        DX = DOS-takeover flag (nonzero if QRIP able to take over DOS)
        ---if DX nonzero---
        BX = QRIP version number in hex (BH = major, BL = minor)
        CX = new flags (see #2134)
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC00h/DI=1092h,AX=ACF0h

Bitfields for QRIP internal flags:
Bit(s)    Description    (Table 2134)
 0    ANSI emulation enabled (default on)
 1    RIP emulation enabled (default on)
 2    graphical commands allowed (default on)
 3    TTY text allowed (default on)
 4    disable @ variables (default off in TSR mode)
 5    wait for key on RIP "end scene" command (default off)
 6    anti-stripping (default off in TSR mode)
 7    sound enabled (default on)
 8    automatic message filter (default off in TSR mode)
 9    display-only mode (no user prompts)
 10    TTY text suppression (default off in TSR mode)
 11-15    reserved
--------V-2FAC02DI1092-----------------------
INT 2F - QRIP/TSR - TURN OFF GRAPHICS SCREEN
    AX = AC02h
    DI = 1092h
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC03h,AX=ACF0h
--------V-2FAC03DI1092-----------------------
INT 2F - QRIP/TSR - TURN ON GRAPHICS SCREEN
    AX = AC03h
    DI = 1092h
Return: nothing
Notes:    if DI <> 1092h on entry, QRIP chains the call
    this function does not restore the contents of the screen (see AX=AC15h)
SeeAlso: AX=AC02h,AX=AC14h,AX=AC15h
--------V-2FAC04DI1092-----------------------
INT 2F - QRIP/TSR - OUTPUT STRING THROUGH QRIP
    AX = AC04h
    DI = 1092h
    DX:BX -> string
    CX = length of string
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC05h,AX=AC09h,AX=AC0Ah,AX=ACF0h
--------V-2FAC05DI1092-----------------------
INT 2F - QRIP/TSR - OUTPUT NULL-TERMINATED STRING THROUGH QRIP
    AX = AC05h
    DI = 1092h
    DX:BX -> ASCIZ string
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC04h,AX=AC06h,AX=AC09h,AX=AC0Ah,AX=ACF0h
--------V-2FAC06DI1092-----------------------
INT 2F - QRIP/TSR - RECEIVE CHARACTERS FROM QRIP
    AX = AC06h
    DI = 1092h
Return: AX = character to send to BBS (0001h-00FFh) or special code (see #2135)
    BX = string-waiting flag
        0001h entire string waiting to be sent to terminal (call AX=AC0Ch)
    CX = DX = AX
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC04h,AX=AC05h,AX=AC0Ch,AX=AC16h,AX=AC18h,AX=AC1Ah

(Table 2135)
Values for QRIP special codes:
 0000h    if none
 0100h    wait for user keypress (must call AX=AC16h/BL=00h or AX=AC18h)
 0101h    both/middle mouse button pressed
 0102h    entering block mode (up/download) (call AX=AC1Ah)
 0103h    right mouse button pressed
 0104h    BBS requested status bar on
 0105h    BBS requested status bar off
 0106h    BBS requested VT-102 terminal emulation
    (keypad keys should send VT-102 escape codes)
 0107h    BBS requested VT-102 mode off
 0108h    BBS requested doorway mode (raw IBM keyboard ASCII/scan code pairs)
 0109h    BBS requested doorway mode off
 010Ah    hotkey mode on
 010Bh    hotkey mode off
 010Ch    BBS requested Tab-key button changing on
 010Dh    BBS requested Tab-key mode off
 010Eh    XOFF (use flow control to stop incoming characters)
 010Fh    XON (use flow control to resume incoming characters)
 0110h-0119h BBS requested application (0-9) be run
    application 0 should be a standard text editor
 01FFh    send ASCII 00h to BBS
Note:    for special codes 0104h to 010Dh, the terminal program should report
      any mode changes it make in response by calling AX=AC16h
--------V-2FAC07DI1092-----------------------
INT 2F - QRIP/TSR - GET FONT DIRECTORY
    AX = AC07h
    DI = 1092h
Return: DX:BX -> 80-byte internal buffer containing ASCIZ font directory name
Notes:    if DI <> 1092h on entry, QRIP chains the call
    the application may change the font directory by overwriting the
      returned buffer, ensuring that it does not exceed 80 bytes incl. NUL
    if changed, the new path will not become effective until the graphics
      screen is reinitialized
SeeAlso: AX=AC08h,AX=ACF0h
--------V-2FAC08DI1092-----------------------
INT 2F - QRIP/TSR - GET ICON DIRECTORY
    AX = AC08h
    DI = 1092h
Return: DX:BX -> 80-byte internal buffer containing ASCIZ icon directory name
Notes:    if DI <> 1092h on entry, QRIP chains the call
    the application may change the icon directory by overwriting the
      returned buffer, ensuring that it does not exceed 80 bytes incl. NUL,
      and includes a trailing backslash
    if changed, the new path becomes effective immediately
SeeAlso: AX=AC07h,AX=ACF0h
--------V-2FAC09DI1092-----------------------
INT 2F - QRIP/TSR - OUTPUT STRING THROUGH QRIP
    AX = AC09h
    DI = 1092h
    DX:BX -> string
    CX = length of string
Return: AX = character to send to BBS (0001h-00FFh) or special code (see #2135)
    BX = string-waiting flag
        0001h entire string waiting to be sent to terminal (call AX=AC0Ch)
    CX = DX = AX
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC04h,AX=AC06h,AX=AC0Ah,AX=ACF0h
--------V-2FAC0ADI1092-----------------------
INT 2F - QRIP/TSR - OUTPUT NULL-TERMINATED STRING THROUGH QRIP
    AX = AC0Ah
    DI = 1092h
    DX:BX -> ASCIZ string
Return: AX = character to send to BBS (0001h-00FFh) or special code (see #2135)
    BX = string-waiting flag
        0001h entire string waiting to be sent to terminal (call AX=AC0Ch)
    CX = DX = AX
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC05h,AX=AC06h,AX=AC09h,AX=ACF0h
--------V-2FAC0BDI1092-----------------------
INT 2F - QRIP/TSR - EXECUTE RIP "END SCENE" COMMAND
    AX = AC0Bh
    DI = 1092h
Return: nothing
Notes:    if DI <> 1092h on entry, QRIP chains the call
    enables all mouse buttons and cancels the RIP timeout
SeeAlso: AX=AC01h,AX=AC04h,AX=ACF0h
--------V-2FAC0CDI1092-----------------------
INT 2F - QRIP/TSR - GET STRING TO BE SENT TO BBS
    AX = AC0Ch
    DI = 1092h
Return: AX = status
        0000h nothing to be sent
        0001h a string is waiting to be sent
        DX:BX -> string to be sent (may contain NULs)
        CX = length of string
        0002h special code waiting (call AX=AC06h)
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC06h,AX=ACF0h
--------V-2FAC0DDI1092-----------------------
INT 2F - QRIP/TSR - SET PROTECTED SCREEN AREA
    AX = AC0Dh
    DI = 1092h
    CL = number of text lines at bottom of screen to protect (00h = off)
    BL = attribute with which to fill area (bit 7 = high-int. background)
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC0Eh,AX=AC0Fh,AX=AC10h,AX=ACF0h
--------V-2FAC0EDI1092-----------------------
INT 2F - QRIP/TSR - WRITE ASCIZ STRING IN PROTECTED AREA
    AX = AC0Eh
    DI = 1092h
    DX:BX -> ASCIZ string to be written
    CL = column at which to begin writing
    CH = row number within protected area (00h = first line)
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC0Dh,AX=AC0Fh,AX=AC10h,AX=ACF0h
--------V-2FAC0FDI1092-----------------------
INT 2F - QRIP/TSR - SCROLL PROTECTED AREA
    AX = AC0Fh
    DI = 1092h
    BH,BL = row,column of upper-left corner in protected area
    DH,DL = row,column of lower-right corner
    CL = number of lines to scroll up
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC0Dh,AX=AC0Eh,AX=AC10h,AX=ACF0h
--------V-2FAC10DI1092-----------------------
INT 2F - QRIP/TSR - SET OUTPUT COLOR FOR PROTECTED AREA
    AX = AC10h
    DI = 1092h
    BL = new attribute (bit 7 set for high-intensity background)
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC0Dh,AX=AC0Eh,AX=AC0Fh,AX=AC11h,AX=ACF0h
--------V-2FAC11DI1092-----------------------
INT 2F - QRIP/TSR - CONVERT PROTECTED AREA TO ENTIRE SCREEN
    AX = AC11h
    DI = 1092h
    BX = mode (0000h = normal protect, 0001h = allow full-screen access)
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC0Dh,AX=AC0Eh,AX=AC0Fh,AX=AC10h,AX=AC12h,AX=ACF0h
--------V-2FAC12DI1092-----------------------
INT 2F - QRIP/TSR - BEGIN POPUP-WINDOW MODE
    AX = AC12h
    DI = 1092h
Return: nothing
Notes:    if DI <> 1092h on entry, QRIP chains the call
    while popup-mode is in effect, the terminal program can write to the
      screen (and easily restore it) by outputting a RIP file with AX=AC04h
      or AX=AC05h
    QRIP will automatically drop out of popup-window mode if the terminal
      program invokes RIP pick-lists
    any changes to the protected area will be restored when popup-window
      mode is cancelled
SeeAlso: AX=AC04h,AX=AC11h,AX=AC13h,AX=ACF0h
--------V-2FAC13DI1092-----------------------
INT 2F - QRIP/TSR - END POPUP-WINDOW MODE
    AX = AC13h
    DI = 1092h
Return: nothing
Notes:    if DI <> 1092h on entry, QRIP chains the call
    restores screen
SeeAlso: AX=AC12h,AX=ACF0h
--------V-2FAC14DI1092-----------------------
INT 2F - QRIP/TSR - SAVE GRAPHICS SCREEN AND SWITCH TO TEXT MODE
    AX = AC14h
    DI = 1092h
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC03h,AX=AC15h
--------V-2FAC15DI1092-----------------------
INT 2F - QRIP/TSR - RESTORE GRAPHICS SCREEN
    AX = AC15h
    DI = 1092h
Return: nothing
Desc:    restores the graphics screen saved by the last call to AX=AC14h
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC03h,AX=AC14h
--------V-2FAC16DI1092-----------------------
INT 2F - QRIP/TSR - REPORT MODE CHANGE TO QRIP
    AX = AC16h
    DI = 1092h
    BL = new mode
        00h terminate key wait
        01h status bar on
        02h status bar off
        03h VT-102 mode on
        04h VT-102 mode off
        05h doorway mode on
        06h doorway mode off
        07h hotkeys mode on
        08h hotkeys mode off
        09h tabkey mode on
        0Ah tabkey mode off
Return: nothing
Notes:    if DI <> 1092h on entry, QRIP chains the call
    all modes default to OFF when QRIP is first installed
--------V-2FAC17DI1092-----------------------
INT 2F - QRIP/TSR - CALL (EXECUTE) A RIP FILE
    AX = AC17h
    DI = 1092h
    DX:BX -> ASCIZ filename for RIP file to be executed
Return: nothing
Notes:    if DI <> 1092h on entry, QRIP chains the call
    the specified file may be in the current icon directory, the QRIP
      startup directory, or the current directory; any pathnames specified
      with the filename are ignored
--------V-2FAC18DI1092-----------------------
INT 2F - QRIP/TSR - SEND USER KEY TO QRIP
    AX = AC18h
    DI = 1092h
    BX = key (00xxh is normal ASCII, xx00h is an extended key)
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC06h,AX=ACF0h
--------V-2FAC19DI1092-----------------------
INT 2F - QRIP/TSR - HANGUP
    AX = AC19h
    DI = 1092h
Return: nothing
Desc:    inform QRIP that carrier has been lost
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=ACF0h
--------V-2FAC1ADI1092-----------------------
INT 2F - QRIP/TSR - GET RIP_ENTER_BLOCK_MODE INFORMATION
    AX = AC1Ah
    DI = 1092h
Return: AH = requested protocol (see #2136)
    AL = file type (see #2137)
    DX:BX -> ASCIZ filename or 0000h:0000h
    CX = length of filename
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=ACF0h

(Table 2136)
Values for QRIP protocol identifier:
 00h    Xmodem (checksum)
 01h    Xmodem-CRC
 02h    Xmodem-1K
 03h    Xmodem-1K-G
 04h    Kermit
 05h    Ymodem
 06h    Ymodem-G
 07h    Zmodem with crash recovery
 08h-0Fh same as 00h-07h, but for uploading instead of downloading
SeeAlso: #2137

(Table 2137)
Values for QRIP file type:
 00h    RIP file sequence to be displayed
 01h    RIP file sequence to be stored in icon directory
 02h    ICN file sequence to be stored in icon directory
 03h    HLP file sequence to be stored, then auto-loaded if needed
 04h    COMPOSITE DYNAMIC file sequence (batch protocols only)
 05h    ACTIVE DYNAMIC file sequence (batch protocols only)
Note:    for file types 04h and 05h, any .RIP or .ICN files are stored in
      the icon directory; in mode 05h, any .RIP files are also played
      back as they are received
SeeAlso: #2136
--------V-2FAC1BDI1092-----------------------
INT 2F - QRIP/TSR - SET SYSTEM FONT SIZE
    AX = AC1Bh
    DI = 1092h
    BX = font size (see #2138)
Return: nothing
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC04h,AX=ACF0h

(Table 2138)
Values for QRIP font size specifier:
 00h    8x8 font, 80x43 screen
 01h    7x8 font, 90x43 screen
 02h    8x14 font, 80x25 screen
 03h    7x14 font, 90x25 screen
 04h    16x14 font, 40x25 screen
--------V-2FACF0DI1092-----------------------
INT 2F - QRIP/TSR - INSTALLATION CHECK
    AX = ACF0h
    DI = 1092h
Return: AX = 9142h if installed
        DX = DOS-takeover flag (nonzero if QRIP able to take over DOS)
        ---if DX nonzero---
        BX = QRIP version number in hex (BH = major, BL = minor)
        CX = current flags (see AX=AC01h)
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=AC00h/DI=1092h,AX=AC01h,AX=AC04h,AX=AC06h,AX=AC1Ah,AX=ACFFh
--------V-2FACFFDI1092-----------------------
INT 2F - QRIP/TSR - UNINSTALL
    AX = ACFFh
    DI = 1092h
Return: AX = status
        0000h unable to remove (interrupt vector hooked by another prog)
        0001h successful
        0002h unable to take over DOS at this time (retry uninstall)
Note:    if DI <> 1092h on entry, QRIP chains the call
SeeAlso: AX=ACF0h
--------V-2FAD00-----------------------------
INT 2F U - DOS 3.3+ DISPLAY.SYS internal - INSTALLATION CHECK
    AX = AD00h
Return: AL = FFh if installed
        BX = ??? (0100h for MS-DOS 3.3+)
Note:    DOS 5+ DISPLAY.SYS chains to previous handler if AL is not one of the
      subfunctions listed here
SeeAlso: AX=AD01h"DISPLAY",AX=AD02h"DISPLAY"
--------O-2FAD00-----------------------------
INT 2F U - DR DOS 3.41-5.0, Novell DOS 7 KEYB - INSTALLATION CHECK
    AX = AD00h
Return: AX = FFFFh if installed
    flags destroyed
SeeAlso: AX=AD80h"Novell"
--------V-2FAD01-----------------------------
INT 2F U - DOS 3.3+ DISPLAY.SYS internal - SET ACTIVE CODE PAGE
    AX = AD01h
    BX = new code page (see #1040 at INT 21/AX=6602h)
Return: CF clear if successful
        AX = 0001h
    CF set on error (unsupported code page)
        AX = 0000h
SeeAlso: AX=AD02h"DISPLAY"
--------O-2FAD01-----------------------------
INT 2F U - DR DOS 3.41,5.0 KEYB - GET CONFIGURATION
    AX = AD01h
Return: BX = current code page (see #1040 at INT 21/AX=6602h)
    CX = current keyboard layout (0100h = US, 0102h = foreign)
    ES = resident code segment
SeeAlso: AX=AD00h"KEYB",AX=AD02h"KEYB",AX=AD83h"KEYB"
--------V-2FAD02-----------------------------
INT 2F U - DOS 3.3+ DISPLAY.SYS internal - GET ACTIVE CODE PAGE
    AX = AD02h
Return: CF set if code page never set
        AX = 0001h
        BX = FFFFh (assume first hardware code page)
    CF clear if successful
        BX = current code page (see #1040 at INT 21/AX=6602h)
SeeAlso: AX=AD01h"DISPLAY",AX=AD03h
--------O-2FAD02-----------------------------
INT 2F U - Novell DOS 7 KEYB - ???
    AX = AD02h
    DX = ??? (0000h)
Return: AX = FFFFh if installed
    flags destroyed
SeeAlso: AX=AD01h"KEYB"
--------V-2FAD03-----------------------------
INT 2F U - DOS 3.3+ DISPLAY.SYS internal - GET CODE PAGE INFORMATION
    AX = AD03h
    ES:DI -> buffer for code page information (see #2139)
    CX = size of buffer in bytes
Return: CF set if buffer too small
    CF clear if successful
        ES:DI buffer filled
SeeAlso: AX=AD01h,AX=AD02h

Format of DOS 5.0-6.0 DISPLAY.SYS code page information:
Offset    Size    Description    (Table 2139)
 00h    WORD    number of software code pages
 02h    WORD    ??? (0003h)
 04h    WORD    number of hardware code pages
 06h  N WORDs    hardware code page numbers (see #1040 at INT 21/AX=6602h)
      N WORDs    software (prepared) code pages (FFFFh if not yet prepared)
--------V-2FAD04-----------------------------
INT 2F U - DOS 4.x only DISPLAY.SYS internal - ???
    AX = AD04h
    ???
Return: ???
--------V-2FAD10-----------------------------
INT 2F U - DOS 4.x DISPLAY.SYS internal - INSTALLATION CHECK???
    AX = AD10h
    ???
Return: AX = FFFFh
    BX = ??? (0100h in PC-DOS 4.01)
--------V-2FAD10-----------------------------
INT 2F U - DOS 5+ DISPLAY.SYS internal - ???
    AX = AD10h
    ???
Return: CF clear if successful
    CF set on error
Note:    this function is a NOP if the active code page has never been set
      (AX=AD02h returns BX=FFFFh); its purpose otherwise is not known
--------V-2FAD40-----------------------------
INT 2F - DOS 4.0+ - ???
    AX = AD40h
    DX = ???
    ???
Return: ???
Note:    called by PC-DOS 4.01 PRINT.COM
--------K-2FAD80-----------------------------
INT 2F u - MS-DOS 3.3+ KEYB.COM internal - INSTALLATION CHECK
    AX = AD80h
Return: AL = FFh if installed
        BX = version number (BH = major, BL = minor)
        ES:DI -> internal data (see #2140)
Notes:    MS-DOS 3.30, PC-DOS 4.01, and MS-DOS 5.00 all report version 1.00.
    this function was undocumented prior to the release of DOS 5.0
SeeAlso: AX=AD80h"Novell",AX=AD81h,AX=AD82h,AX=AD83h

Format of KEYB internal data:
Offset    Size    Description    (Table 2140)
 00h    DWORD    original INT 09
 04h    DWORD    original INT 2F
 08h  6 BYTEs    ???
 0Eh    WORD    flags (see #2141)
 10h    BYTE    ???
 11h    BYTE    ???
 12h  4 BYTEs    ???
 16h  2 BYTEs    country ID letters
 18h    WORD    current code page (see #1040 at INT 21/AX=6602h)
---DOS 3.3---
 1Ah    WORD    pointer to first item in list of code page tables???
 1Ch    WORD    pointer to ??? item in list of code page tables
 1Eh  2 BYTEs    ???
 20h    WORD    pointer to key translation data (see #2143)
 22h    WORD    pointer to last item in code page table list (see #2142)
 24h  9 BYTEs    ???
---DOS 4.01---
 1Ah  2 BYTEs    ???
 1Ch    WORD    pointer to first item in list of code page tables???
 1Eh    WORD    pointer to ??? item in list of code page tables
 20h  2 BYTEs    ???
 22h    WORD    pointer to key translation data (see #2143)
 24h    WORD    pointer to last item in code page table list (see #2142)
 26h  9 BYTEs    ???
Note:    at least in MS-DOS v6.22, the signature "SHARED DATA" immediately
      precedes this structure

Bitfields for MS-DOS v6.22 KEYB flags:
Bit(s)    Description    (Table 2141)
 15    INT 16/AH=1xh supported (INT 16h/AH=92h call returns AH<=80h)
 14    INT 16/AH=2xh supported (INT 16h/AH=A2h call returns AH<=80h)
 13    unused (0)
 12    network installed (INT 2F/AX=B800h)
 11    original IBM PC (BIOS date 1981)
 10    PC or PC/XT (BIOS machine type byte of FBh or FEh)
 9    PC Convertible (BIOS machine type byte of F9h); use INT 15/AX=4104h
 8    unused (0)
 7    IBM PS/2 model 30 (BIOS machine type byte of FAh)
 6    IBM AT (BIOS machine type FCh)
 5    IBM PS/2 (BIOS machine type F8h)
 4    PS/2 and unknown only:
    non-standard 8042 or no AT->PC scancode translation???
 3    temporary flag???
 2-0    ???
SeeAlso: #2140

Format of code page table list entries:
Offset    Size    Description    (Table 2142)
 00h    WORD    pointer to next item, FFFFh = last
 02h    WORD    code page (see #1040 at INT 21/AX=6602h)
 04h  2 BYTEs    ???

Format of KEYB translation data:
Offset    Size    Description    (Table 2143)
 00h    WORD    size of data in bytes, including this word
 02h N-2 BYTEs    ???
--------K-2FAD80-----------------------------
INT 2F u - Novell DOS 7 KEYB.COM - INSTALLATION CHECK
    AX = AD80h
Return: AX = FFFFh if installed
        CX = Novell DOS KEYB version number (CL = major, CH = minor)
        DX = current keyboard codepage
        ES:DI -> internal data and tables (ES=FFFEh if KEYB in HMA)
    flags destroyed
Note:    versions: v2.08 (original ship 4/94), v2.09 (Update 10, 11/18/94),
      v2.10 (Update 12, 2/22/95), v2.11 (Update 13, 5/8/95),
      v2.12 (Update 14, 7/31/95)
SeeAlso: AX=AD80h"MS-DOS"
--------K-2FAD81-----------------------------
INT 2F - DOS 3.3+ KEYB.COM - SET KEYBOARD CODE PAGE
    AX = AD81h
    BX = code page (see #1040 at INT 21/AX=6601h)
Return: CF set on error
        AX = 0001h (code page not available)
    CF clear if successful
Notes:    called by DISPLAY.SYS
    this function was undocumented prior to the release of DOS 5.0
SeeAlso: AX=AD80h,AX=AD82h
--------K-2FAD82-----------------------------
INT 2F - DOS 3.3+ KEYB.COM - SET KEYBOARD MAPPING
    AX = AD82h
    BL = new state
        00h US keyboard (Control-Alt-F1)
        FFh foreign keyboard (Control-Alt-F2)
Return: CF set on error (BL not 00h or FFh)
    CF clear if successful
Note:    this function was undocumented prior to the release of DOS 5.0
SeeAlso: AX=AD80h,AX=AD81h,AX=AD83h
--------K-2FAD83-----------------------------
INT 2F - DOS 5+ KEYB.COM - GET KEYBOARD MAPPING
    AX = AD83h
Return: BL = current state
        00h US keyboard
        FFh foreign keyboard
SeeAlso: AX=AD82h
--------l-2FAE00-----------------------------
INT 2F U - DOS 3.3+ internal - INSTALLABLE COMMAND - INSTALLATION CHECK
    AX = AE00h
    DX = magic value FFFFh
    CH = FFh
    CL = length of command line tail (4DOS v4.0)
    DS:BX -> command line buffer (see #2144)
    DS:SI -> command name buffer (see #2145)
    DI = 0000h (4DOS v4.0)
Return: AL = FFh if this command is a TSR extension to COMMAND.COM
    AL = 00h if the command should be executed as usual
Notes:    This call provides a mechanism for TSRs to install permanent
      extensions to the command repertoire of COMMAND.COM.    It appears
      that COMMAND.COM makes this call before executing the current
      command line, and does not execute it itself if the return is FFh.
    APPEND hooks this call, to allow subsequent APPEND commands to
      execute without re-running APPEND
SeeAlso: AX=AE01h

Format of COMMAND.COM command line buffer:
Offset    Size    Description    (Table 2144)
 00h    BYTE    max length of command line, as in INT 21/AH=0Ah
 01h    BYTE    count of bytes to follow, excluding terminating 0Dh
      N BYTEs    command line text, terminated by 0Dh

Format of command name buffer:
Offset    Size    Description    (Table 2145)
 00h    BYTE    length of command name
 01h  N BYTEs    uppercased command name (blank-padded to 11 chars by 4DOS v4)
--------l-2FAE01-----------------------------
INT 2F U - DOS 3.3+ internal - INSTALLABLE COMMAND - EXECUTE
    AX = AE01h
    DX = magic value FFFFh
    CH = 00h
    CL = length of command name (4DOS v4.0)
    DS:BX -> command line buffer (see #2144)
    DS:SI -> command name buffer (see #2145)
Return: DS:SI buffer updated
      if length byte is nonzero, the following bytes contain the uppercase
      internal command to execute and the command line buffer contains the
      command's parameters (the first DS:[SI] bytes are ignored)
Notes:    this call requests execution of the command which a previous call to
      AX=AE00h indicated was resident
    APPEND hooks this call
BUG:    Novell DOS 7.0's COMMAND.COM (prior to Update 12) will attempt to run
      a disk program with the indicated name even if the returned length
      byte is zero, because the register used to flag this case is
      clobbered without first checking it.    The workaround is to set the
      command name buffer to "REM" followed by enough blanks to pad out
      the original command's length, which will also work with MS-DOS 6.
      (from [e-mail])
SeeAlso: AX=AE00h
--------O-2FAF00-----------------------------
INT 2F - WinDOS v2.11 - INSTALLATION CHECK
    AX = AF00h
Return: AL = FFh if installed
Program: WinDOS is a DOS clone (claimed to be mostly MS-DOS 5.0 API compatible)
      written by Heiko Goemann
SeeAlso: AX=AF01h"WinDOS",INT 21/AH=30h
----------2FAF00-----------------------------
INT 2F U - ???
    AX = AF00h
    ???
Return: AX = 0000h if interface supported
SeeAlso: AX=AF02h,AX=AF03h,AX=AF04h,AX=AF13h,AX=AF30h
--------O-2FAF01-----------------------------
INT 2F - WinDOS v2.11 - TURN ON ONLINE MODE
    AX = AF01h
Return: nothing
Desc:    indicate that the user will not exchange floppy disks, allowing WinDOS
      to cache disk sectors in memory and avoid writing modified sectors
      back out to the floppy disk
SeeAlso: AX=AF00h"WinDOS",AX=AF02h"WinDOS"
--------O-2FAF02-----------------------------
INT 2F - WinDOS v2.11 - TURN OFF ONLINE MODE
    AX = AF02h
Return: nothing
Desc:    indicate that the floppy disk may be removed, and that WinDOS should
      write all buffered sectors out to the floppy disk
SeeAlso: AX=AF00h"WinDOS",AX=AF01h"WinDOS"
----------2FAF02-----------------------------
INT 2F U - ???
    AX = AF02h
    ???
Return: ES = ???
SeeAlso: AX=AF00h
--------O-2FAF03-----------------------------
INT 2F - WinDOS v2.11 - TURN VIDMEM ON
    AX = AF03h
Return: AX = status
        0000h successful
        0001h CPU not in mode set by DOS386=On
        0002h video adapter in graphics mode
        0003h memory chain corrupted
SeeAlso: AX=AF00h"WinDOS",AX=AF04h"WinDOS",AX=AF05h"WinDOS"
----------2FAF03-----------------------------
INT 2F U - ???
    AX = AF03h
    ???
Return: DX = ???
SeeAlso: AX=AF00h
--------O-2FAF04-----------------------------
INT 2F - WinDOS v2.11 - TURN VIDMEM OFF
    AX = AF04h
Return: AX = status
        0000h successful
        0001h video memory is in use
SeeAlso: AX=AF00h"WinDOS",AX=AF03h"WinDOS",AX=AF05h"WinDOS"
----------2FAF04-----------------------------
INT 2F U - ???
    AX = AF04h
    ???
Return: ???
SeeAlso: AX=AF00h
--------O-2FAF05-----------------------------
INT 2F - WinDOS v2.11 - GET VIDMEM STATE
    AX = AF05h
Return: AX = status (0000h off, 0001h on)
SeeAlso: AX=AF00h"WinDOS",AX=AF03h"WinDOS",AX=AF04h"WinDOS"
----------2FAF05-----------------------------
INT 2F U - ???
    AX = AF05h
    ???
Return: ???
SeeAlso: AX=AF00h
--------O-2FAF06-----------------------------
INT 2F - WinDOS v2.11 - MAKE PROGRAM UNBREAKABLE
    AX = AF06h
    DS:DX -> break handler
    DI:BX = stack to use for break handler
Return: nothing
Desc:    set a handler which should be invoked when Ctrl-C is pressed instead of
      aborting the program
SeeAlso: AX=AF00h"WinDOS",AX=AF0Ah"WinDOS",AX=AF0Ch"WinDOS"
--------O-2FAF07-----------------------------
INT 2F - WinDOS v2.11 - SIGNAL FATAL OVERLAY FAULT
    AX = AF07h
Return: never -- system reset
Desc:    pop up a window indicating that the system overlay file can not be
      loaded
SeeAlso: AX=AF00h"WinDOS",AX=AF08h"WinDOS"
--------O-2FAF08-----------------------------
INT 2F - WinDOS v2.11 - SIGNAL RECOVERABLE OVERLAY FAULT
    AX = AF08h
Return: nothing
Desc:    pop up a window requesting that a disk containing SH.OVL be inserted
SeeAlso: AX=AF00h"WinDOS",AX=AF07h"WinDOS",AX=AF0Bh
--------O-2FAF09-----------------------------
INT 2F - WinDOS v2.11 - GET TERMINATED PSP
    AX = AF09h
Return: DS = PSP segment of most recently ended TSR
SeeAlso: AX=AF00h"WinDOS",AX=AF0Ah
--------O-2FAF0A-----------------------------
INT 2F - WinDOS v2.11 - GET MAIN SHELL PSP
    AX = AF0Ah
Return: AX = shell's PSP (same as DS on last call to AX=AF06h)
Desc:    get the PSP address of the last program to call AX=AF06h (normally
      the main command interpreter)
SeeAlso: AX=AF00h"WinDOS",AX=AF06h"WinDOS",AX=AF09h
--------O-2FAF0B-----------------------------
INT 2F - WinDOS v2.11 - SIGNAL FATAL ERROR
    AX = AF0Bh
Return: never -- system reset
Desc:    pop up a window indicating a terminal system error
SeeAlso: AX=AF00h"WinDOS",AX=AF07h,AX=AF08h,AX=AF15h"WinDOS"
--------O-2FAF0C-----------------------------
INT 2F - WinDOS v2.11 - GET OTHER MAIN SHELL PARAMETERS
    AX = AF0Ch
Return: DI:AX = stack
    SI = offset of break handler
Desc:    retrieve the parameters last set by AX=AF06h (normally by the main
      command interpreter)
SeeAlso: AX=AF00h"WinDOS",AX=AF06h"WinDOS"
--------O-2FAF0D-----------------------------
INT 2F - WinDOS v2.11 - GET CURRENT PARAMETER
    AX = AF0Dh
    BX = offset of desired parameter in global data area
Return: AX = current value of parameter (AH undefined if byte value)
SeeAlso: AX=AF00h"WinDOS",AX=AF0Eh
--------O-2FAF0E-----------------------------
INT 2F - WinDOS v2.11 - SET CURRENT PARAMETER BYTE VALUE
    AX = AF0Eh
    BX = offset of desired parameter in global data area
    DL = new value of parameter
Return: nothing
SeeAlso: AX=AF00h"WinDOS",AX=AF0Dh
--------O-2FAF0F-----------------------------
INT 2F - WinDOS v2.11 - GET HISTORY SEGMENT
    AX = AF0Fh
Return: AX = segment of buffer for input history, or 0000h if none
SeeAlso: AX=AF00h"WinDOS",AX=AF10h"WinDOS"
--------O-2FAF10-----------------------------
INT 2F - WinDOS v2.11 - SET HISTORY SEGMENT
    AX = AF10h
    BX = segment of new buffer for input history
Return: nothing
Note:    the buffer must have been allocated with INT 21/AH=48h
SeeAlso: AX=AF00h"WinDOS",AX=AF0Fh"WinDOS"
--------O-2FAF11-----------------------------
INT 2F - WinDOS v2.11 - FREE XMS BLOCKS
    AX = AF11h
Return: nothing
Desc:    free all XMS blocks whose XMS identification value (see AX=AF12h)
      equals the current PSP
SeeAlso: AX=AF00h"WinDOS",AX=AF12h"WinDOS",INT 21/AH=50h
--------O-2FAF12-----------------------------
INT 2F - WinDOS v2.11 - SET XMS IDENTIFICATION VALUE
    AX = AF12h
    DS = new XMS identification value (normally caller's PSP segment)
Return: nothing
SeeAlso: AX=AF00h"WinDOS",AX=AF11h"WinDOS"
----------2FAF12-----------------------------
INT 2F U - ???
    AX = AF12h
    ???
Return: ES = ???
SeeAlso: AX=AF00h
--------O-2FAF13-----------------------------
INT 2F - WinDOS v2.11 - SET ASSIGN VALUE
    AX = AF13h
    BL = number of drive to remap (00h = A:)
    DL = number of drive to be accessed via drive number BL
Return: nothing
Desc:    remap a drive letter
Note:    the remapping can be canceled by specifying DL=BL
SeeAlso: AX=AF00h"WinDOS",AX=AF14h"WinDOS",AX=0601h
----------2FAF13-----------------------------
INT 2F U - ???
    AX = AF13h
    ???
Return: ???
SeeAlso: AX=AF00h
--------O-2FAF14-----------------------------
INT 2F - WinDOS v2.11 - GET ASSIGN VALUE
    AX = AF14h
    BL = drive number (00h = A:)
Return: DL = drive number which is actually accessed by drive number BL
Desc:    determine the current mapping for a drive
SeeAlso: AX=AF00h"WinDOS",AX=AF13h"WinDOS",AX=0601h
--------O-2FAF15-----------------------------
INT 2F - WinDOS v2.11 - SIGNAL STACK ERROR
    AX = AF15h
Return: never -- system reset
Desc:    pop up a window indicating a stack overflow
SeeAlso: AX=AF00h"WinDOS",AX=AF0Bh"WinDOS"
--------O-2FAF16-----------------------------
INT 2F - WinDOS v2.11 - GET SIMPLE TRUENAME
    AX = AF16h
    DS:SI -> path to be canonicalized
    ES:DI -> buffer for canonicalized filename/pathname
Return: CF clear if successful
        AX = 0000h
    CF set on error
        AX = DOS error code (see #0960 at INT 21/AH=59h)
Desc:    partially canonicalize a path, omitting SUBST, JOIN, ASSIGN, and
      network redirections
SeeAlso: AX=AF00h"WinDOS",INT 21/AH=60h
--------O-2FAF17-----------------------------
INT 2F - WinDOS v2.11 - QUERY FOR NEW CURRENT DRIVE
    AX = AF17h
Return: nothing
Desc:    pop up a dialog allowing the user to select a new default drive
SeeAlso: AX=AF00h"WinDOS"
--------O-2FAF18-----------------------------
INT 2F - WinDOS v2.11 - SET CTRL-C/CTRL-BREAK DISABLE FLAG
    AX = AF18h
    DL = new break-checking state (00h enabled, 01h disabled)
Return: nothing
SeeAlso: AX=AF00h"WinDOS"
--------O-2FAF19-----------------------------
INT 2F - WinDOS v2.11 - SET HEAD SETTLE FLAG
    AX = AF19h
    DL = new state
        00h diskette head settling time reset to 15ms before each access
        01h no additional head settling time used between accesses
Return: nothing
SeeAlso: AX=AF00h"WinDOS"
--------O-2FAF1A-----------------------------
INT 2F - WinDOS v2.11 - SEARCH FOR NON-FRAGMENTED DISK AREA
    AX = AF1Ah
    BL = drive (00h = current, 01h = A:, etc.)
    CX = number of clusters desired
Return: CF clear if successful
        DI = first free cluster on logical drive
        BP = first cluster of contiguous free area
        AX destroyed
    CF set on error
        AX = DOS error code (see #0960 at INT 21/AH=59h)
Desc:    attempt to find an area of the disk containing the specified number
      of contiguous unallocated clusters
SeeAlso: AX=AF00h"WinDOS"
----------2FAF30-----------------------------
INT 2F U - ???
    AX = AF30h
    ???
Return: ???
SeeAlso: AX=AF00h
--------d-2FAFDE-----------------------------
INT 2F - Disk-Emu - INSTALLATION CHECK / GET VERSION
    AX = AFDEh
    ES:DI -> 14-byte buffer for data (see #2146)
Return: AX = CFDEh (Carlos Fernandez Disk-Emu) if installed
        BX = version (BH = major, BL = minor)

Format of Disk-Emu information data:
Offset    Size    Description    (Table 2146)
 00h    BYTE    number of tracks
 01h    BYTE    sectors per track
 02h    WORD    bytes per sector
 04h    BYTE    number of heads
 05h    BYTE    flag: 00h inactive, 01h active
 06h    BYTE    write protection (00h none, 01h full, 02h pseudo)
 07h    BYTE    saved (00h some unsaved data, 01h all data saved)
 08h    BYTE    disk in memory (00h no, 01h yes)
 09h    WORD    EMS handle
 0Bh    WORD    XMS handle
 0Dh    BYTE    memory type used for disk (00h XMS, 01h EMS)
--------V-2FB000-----------------------------
INT 2F - DOS 3.3+ GRAFTABL.COM - INSTALLATION CHECK
    AX = B000h
Return: AL = status
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
Notes:    called by DISPLAY.SYS
    documented for DOS 5.0, but undocumented in prior versions
SeeAlso: AX=2300h,AX=2E00h,AX=B001h
--------V-2FB001-----------------------------
INT 2F - DOS 3.3+ GRAFTABL.COM - GET GRAPHICS FONT TABLE
    AX = B001h
    DS:BX -> DWORD buffer for address of 8x8 font table
Return: buffer filled
    AL = FFh
Note:    PC-DOS 3.30/4.01 and MS-DOS 6.0 set the font table offset to 0130h,
      MS-DOS 3.30 sets it to 0030h
SeeAlso: AH=2Eh"GRAFTABL",AX=B000h
--------I-2FB400-----------------------------
INT 2F - IBM PC3270 EMULATION PROG v3 - INSTALLATION CHECK
    AX = B400h
Return: AL = FFh if installed
--------I-2FB401-----------------------------
INT 2F - IBM PC3270 EMULATION PROG v3 - GET HOST BUFFER ADDRESS
    AX = B401h
Return: ES -> host screen buffer (PC ASCII format)
    ES unchanged if communications not started
--------I-2FB402-----------------------------
INT 2F - IBM PC3270 EMULATION PROG v3 - ???
    AX = B402h
    BX = ???
Return: ???
--------I-2FB403-----------------------------
INT 2F - IBM PC3270 EMULATION PROG v3 - ???
    AX = B403h
    ???
Return: ???
--------I-2FB404-----------------------------
INT 2F - IBM PC3270 EMULATION PROG v3 - ???
    AX = B404h
    ???
Return: ???
--------I-2FB405-----------------------------
INT 2F - IBM PC3270 EMULATION PROG v3 - ???
    AX = B405h
    ???
Return: ???
--------f-2FB700-----------------------------
INT 2F - APPEND - INSTALLATION CHECK
    AX = B700h
Return: AL = status
        00h not installed
        FFh installed
Note:    MS-DOS 3.30 APPEND refuses to install itself when run inside TopView or
      a TopView-compatible environment
SeeAlso: AX=B702h
--------f-2FB701-----------------------------
INT 2F U - APPEND v3.21 only - GET APPEND PATH
    AX = B701h
Return: ES:DI -> active APPEND path
Notes:    the only version of APPEND known to support this call is the APPEND
      shipped with Microtek MS-DOS 3.21; MS-DOS 3.30-6.00 APPEND displays
      "Incorrect APPEND Version" and aborts the caller
    use AX=B704h first, and only call this function if that one is not
      supported
SeeAlso: AX=B700h,AX=B704h
--------f-2FB702-----------------------------
INT 2F - APPEND - GET VERSION
    AX = B702h
Return: AX = FFFFh if not DOS 4.0 APPEND (also if DOS 5.0 APPEND)
    AL = major version number
    AH = minor version number, otherwise
SeeAlso: AX=B700h,AX=B710h
--------f-2FB703-----------------------------
INT 2F U - DOS 3.3, DOS 5.0 APPEND - HOOK INT 21
    AX = B703h
    ES:DI -> INT 21 handler APPEND should chain to
Return: ES:DI -> APPEND's INT 21 handler
Note:    each invocation of this function toggles a flag which APPEND uses to
      determine whether to chain to the user handler or the original
      INT 21
SeeAlso: AX=B700h,AX=B706h
--------f-2FB704-----------------------------
INT 2F - DOS 3.3+ APPEND - GET APPEND PATH
    AX = B704h
Return: ES:DI -> active APPEND path (128 bytes max)
Note:    some versions of append do not support this call, and return ES
      unchanged; in this case, you should call AX=B701h to get the APPEND
      path
SeeAlso: AX=B701h
--------f-2FB706-----------------------------
INT 2F - DOS 4.0+ APPEND - GET APPEND FUNCTION STATE
    AX = B706h
Return: BX = APPEND state (see #2147)
SeeAlso: AX=B700h,AX=B707h

Bitfields for APPEND state:
Bit(s)    Description    (Table 2147)
 0    set if APPEND enabled
 1-11    reserved
 12    (DOS 5.0) set if APPEND applies directory search even if a drive has
      been specified
 13    set if /PATH flag active
 14    set if /E flag active (environment var APPEND exists)
 15    set if /X flag active
--------f-2FB707-----------------------------
INT 2F - DOS 4.0+ APPEND - SET APPEND FUNCTION STATE
    AX = B707h
    BX = APPEND state bits (see #2147)
SeeAlso: AX=B700h,AX=B706h
--------f-2FB710-----------------------------
INT 2F U - DOS 3.3+ APPEND - GET VERSION INFO
    AX = B710h
Return: AX = current APPEND state (see #2147)
    BX = ??? (0000h in MS-DOS 3.30 and 5.00)
    CX = ??? (0000h in MS-DOS 3.30 and 5.00)
    DL = major version
    DH = minor version
SeeAlso: AX=B700h,AX=B702h
--------f-2FB711-----------------------------
INT 2F - DOS 4.0+ APPEND - SET RETURN FOUND NAME STATE
    AX = B711h
Note:    if the next INT 21h call (and ONLY the next) is function 3Dh, 43h, or
      6Ch (also 4B03h and 4Eh if /X active), the fully qualified filename
      is written over top of the filename passed to the INT 21h call.  The
      application must provide a sufficiently large buffer.     This state is
      reset after the next INT 21h call processed by APPEND.
    APPEND uses the byte at offset 3Dh in the PSP
      (see #0677 at INT 21/AH=26h) to store the flag telling it to
      overwrite the filename
BUG:    DOS 4.0 APPEND reportedly overwrites DS:DX instead of DS:SI for
      INT 21/AH=6Ch
SeeAlso: INT 21/AH=26h,INT 21/AH=4Eh
--------N-2FB800-----------------------------
INT 2F - NETWORK - INSTALLATION CHECK
    AX = B800h
Return: AL = status
        00h        not installed
        nonzero installed
          BX = installed component flags (test in this order!)
           bit 6   server
           bit 2   messenger
           bit 7   receiver
           bit 3   redirector
           bit 1   LANPUP (LANtastic 4.0)
Notes:    this function is supported by PC LAN Program, LAN Manager, LANtastic,
      NetWare Lite, SilverNET, 10NET, etc.
    LANtastic and NetWare Lite use only BL for the return value, preserving
      BH; LAN Manager and DOS LAN Requester return BH=00h.    This permits
      differentiation between those two groups by setting BH to a nonzero
      value before the call and checking its value on return.
SeeAlso: AX=4E53h,AX=B809h
--------N-2FB800CXF041-----------------------
INT 2F - 10NET - INSTALLATION CHECK
    AX = B800h
    CX = F041h
Return: AL = status
        00h        not installed
        nonzero installed
        BX = installed component flags (test in this order!)
           bit 6   server
           bit 2   messenger
           bit 7   receiver
           bit 3   redirector
           bit 1   LANPUP (LANtastic 4.0)
        CX = 10Net data segment
        CX:DX -> 10Net Configuration Table
              (see #0971 at INT 21/AX=5E01h"10NET")
Note:    if CX <> F041h on entry, neither CX nor DX will be changed, and this
      call becomes identical to the standard installation check above
SeeAlso: AX=B800h"network",INT 21/AX=5E01h"10NET"
--------N-2FB803-----------------------------
INT 2F - NETWORK - GET NETWORK EVENT POST HANDLER
    AX = B803h
Return: ES:BX -> current event post handler (see AX=B804h)
Note:    this function is supported by PC LAN Program, 10NET v5.0
SeeAlso: AC=B800h,AX=B804h,AX=B903h
--------N-2FB804-----------------------------
INT 2F - NETWORK - SET NETWORK EVENT POST HANDLER
    AX = B804h
    CX = (10NET) 0370h if 10Windows is hooking post handler
    ES:BX -> new event post handler (see #2148)
Notes:    used in conjunction with AX=B803h to hook into the network event post
      routine
    this function is supported by PC LAN Program, 10NET v5.0
    The specified handler is called on any network event.  Two events are
      defined: message received and critical network error.
SeeAlso: AX=B800h,AX=B803h,AX=B904h

(Table 2148)
Values network post routine is called with:
    AX = 0000h single block message
        DS:SI -> ASCIZ originator name
        DS:DI -> ASCIZ destination name
        ES:BX -> text header (see #2149)
    AX = 0001h start multiple message block
        CX = block group ID
        DS:SI -> ASCIZ originator name
        DS:DI -> ASCIZ destination name
    AX = 0002h multiple block text
        CX = block group ID
        ES:BX -> text header (see #2149)
    AX = 0003h end multiple block message
        CX = block group ID
    AX = 0004h message aborted due to error
        CX = block group ID
    AX = 0101h server received badly formatted network request
        Return: AX = FFFFh (PC LAN will process error)
    AX = 0102h unexpected network error
        ES:BX -> NCB (see #2381 at INT 5C)
    AX = 0103h server received INT 24 error
        other registers as for INT 24, except AH is in BH
        Return: as below, but only 0000h and FFFFh allowed
Return: AX = response code
        0000h user post routine processed message
        0001h PC LAN will process message, but message window not displayed
        FFFFh PC LAN will process message

Format of text header:
Offset    Size    Description    (Table 2149)
 00h    WORD    length of text (maximum 512 bytes)
 02h  N BYTEs    text of message
Note:    all CRLF sequences in message text are replaced by 14h; all other
      values below 20h (space) are reserved
--------N-2FB807-----------------------------
INT 2F - NETWORK - GET NetBIOS NAME NUMBER OF MACHINE NAME
    AX = B807h
Return: CH = NetBIOS name number of the machine name
SeeAlso: INT 21/AX=5E00h
--------N-2FB808-----------------------------
INT 2F U - NETWORK - RELINK KEYBOARD HANDLER
    AX = B808h
    ES:BX -> INT 09 handler network should call after it finishes INT 09
Notes:    this call replaces the address to which the network software chains on
      an INT 09 without preserving the original value.  This allows a prior
      handler to unlink, but does not allow a new handler to be added
      such that the network gets the INT 09 first unless the new handler
      completely takes over INT 09 and never chains.
    this function is called by the DOS 3.2 KEYBxx.COM
SeeAlso: AX=B908h
--------N-2FB809-----------------------------
INT 2F - NETWORK - LANtastic, NetWare Lite - GET VERSION
    AX = B809h
Return: AH = major version
    AL = minor version (decimal)
Notes:    this function is supported in this form by LANtastic, NetWare Lite,
      SilverNET, ...
    NetWare Lite returns its own version number rather than a PC LAN
      compatibility version
SeeAlso: AX=4E53h,AX=B800h,AX=B809h"PC LAN Program"
--------N-2FB809-----------------------------
INT 2F - NETWORK - PC LAN Program - GET VERSION
    AX = B809h
Return: AH = minor version (decimal)
    AL = major version
Notes:    this function is supported in this form by PC LAN Program, LAN Manager,
      the DOS LAN Requester, and 10NET v5.0
    10NET returns version 1.10 (AX=0A01h) for compatibility
SeeAlso: AX=4E53h,AX=B800h,AX=B809h"LANtastic"
--------N-2FB80A-----------------------------
INT 2F u - PC Network 1.00 - ???
    AX = B80Ah
    ???
Return: ???
Program: PC Network is an early networking package which was renamed the
      IBM PC Local Area Network Program (PC LAN Program) as of v1.10
Note:    called by RECEIVER (equivalent to NetWare Lite SERVER)
--------N-2FB80F-----------------------------
INT 2F - DOS LAN Requester - GET START PARAMETERS
    AX = B80Fh
    CX = size of return data buffer
    ES:DI -> return data buffer (see #2150)
Return: AX = status
         00h     network started
         nonzero network not started
    CX = number of bytes returned in buffer
    ES:DI buffer filled
SeeAlso: AX=B809h"PC LAN Program"

Format of DOS LAN Requester return data buffer:
Offset    Size    Description    (Table 2150)
 00h    BYTE    major version
 01h    BYTE    minor version
 02h    WORD    configuration flags given when network was started (see #2151)
 04h 15 BYTEs    NET START machine name (space padded)
 13h    BYTE    00h
 14h 9    BYTEs    NET START domain name (NULL padded)
 1Dh    BYTE    00h
 1Eh 32 BYTEs    /WRK heuristics string (space padded, not terminated)
 3Eh    WORD    /SRV value
 40h    WORD    /ASG value
 42h    WORD    /NBC value
 44h    WORD    /NBS value
 46h    WORD    /BBC value
 48h    WORD    /BBS value
 4Ah    WORD    /PBC value
 4Ch    WORD    /PBS value
 4Eh    WORD    /PFS value
 50h    WORD    /PFT value
 52h    WORD    /PWT value
 54h    WORD    /KUC value
 56h    WORD    /KST value
 58h    WORD    /NVS value
 5Ah    WORD    /NMS value
 5Ch    WORD    /NDB value
 5Eh    WORD    /MBI value
 60h    BYTE    NetBIOS name number for machine name
 61h    BYTE    NetBIOS name number for domain name
 62h    WORD    NetBIOS sessions required for configuration
 64h    WORD    NetBIOS commands required for configuration
 66h    WORD    NetBIOS names required for configuration
 68h 128 BYTEs    NET START path (LANROOT)
 E8h    BYTE    00h

Bitfields for configuration flags:
Bit(s)    Description    (Table 2151)
 0    /NVS nonzero
 1    /NMS nonzero
 2    /API
 3    /HIM
 4    /LIM
 5    /ENC
 6    /POP
 7    /EMS
 8    /RPL
 9-12    reserved
 13    RDR started
 14    RCV started
 15    User is currently logged on
--------N-2FB900-----------------------------
INT 2F - PC Network RECEIVER.COM - INSTALLATION CHECK
    AX = B900h
Return: AL = state
        00h if not installed
        FFh if installed
--------N-2FB901-----------------------------
INT 2F - PC Network RECEIVER.COM - GET RECEIVER.COM INT 2F HANDLER ADDRESS
    AX = B901h
Return: AL = ???
    ES:BX -> RECEIVER.COM INT 2F handler
Desc:    allows more efficient execution by letting the caller bypass any other
      INT 2F handlers which have been added since RECEIVER.COM was
      installed
--------N-2FB903-----------------------------
INT 2F - PC Network RECEIVER.COM - GET RECEIVER.COM POST ADDRESS
    AX = B903h
Return: ES:BX -> POST handler
SeeAlso: AX=B803h,AX=B904h
--------N-2FB904-----------------------------
INT 2F - PC Network RECEIVER.COM - SET RECEIVER.COM POST ADDRESS
    AX = B904h
    ES:BX -> new POST handler
SeeAlso: AX=B804h,AX=B903h
--------N-2FB905-----------------------------
INT 2F - PC Network RECEIVER.COM - GET FILENAME
    AX = B905h
    DS:BX -> 128-byte buffer for filename 1
    DS:DX -> 128-byte buffer for filename 2
Return: buffers filled from RECEIVER.COM internal buffers
Note:    use of filenames is unknown, but one appears to be for storing messages
SeeAlso: AX=B906h
--------N-2FB906-----------------------------
INT 2F - PC Network RECEIVER.COM - SET FILENAME
    AX = B906h
    DS:BX -> 128-byte buffer for filename 1
    DS:DX -> 128-byte buffer for filename 2
Return: RECEIVER.COM internal buffers filled from user buffers
Note:    use of filenames is unknown, but one appears to be for storing messages
SeeAlso: AX=B905h
--------N-2FB908-----------------------------
INT 2F - PC Network RECEIVER.COM - UNLINK KEYBOARD HANDLER
    AX = B908h
    ES:BX -> INT 09 handler RECEIVER should call after it finishes INT 09
Note:    this call replaces the address to which RECEIVER.COM chains on an
      INT 09 without preserving the original value.     This allows a prior
      handler to unlink, but does not allow a new handler to be added
      such that RECEIVER gets the INT 09 first.
SeeAlso: AX=B808h
--------V-2FBC00-----------------------------
INT 2F - Windows 3.0, DOS 5+ EGA.SYS - INSTALLATION CHECK
    AX = BC00h
Return: AL = state
        00h not installed, OK to install
        01h not installed, not OK to install
        FFh installed
        BX = 5456h ("TV")
Range:    AH=80h to AH=FFh, selected by commandline switch
SeeAlso: AX=BC06h"EGA",INT 10/AH=FAh"EGA"
--------s-2FBC00BX3F3F-----------------------
INT 2F - MediaVision MVSOUND.SYS - INSTALLATION CHECK
    AX = BC00h
    BX = 3F3Fh ('??')
    CX = 0000h
    DX = 0000h
Return: if installed, BX XOR CX XOR DX = 4D56h ('MV')
Program: MVSOUND.SYS is a driver for the MediaVision ProAudio Spectrum family
      of sound boards; its primary programmer was Bryan Crane
SeeAlso: AX=BC01h"MVSOUND",AX=BC02h,AX=BC03h,AX=BC04h,AX=BC06h"MVSOUND"
--------s-2FBC01-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET VERSION
    AX = BC01h
    BX = magic value 6D20h ('m ')
    CX = magic value 2076h (' v')
    DX = magic value 2020h ('  ')
Return: BX = ASCII major version (leading zeros significant)
    CX = ASCII minor version (leading zeros significant)
SeeAlso: AX=BC00h/BX=3F3Fh
--------s-2FBC02-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET STATE TABLE POINTER
    AX = BC02h
Return: BX:DX -> state table
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC03h
--------s-2FBC03-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET FUNCTION TABLE POINTER
    AX = BC03h
Return: BX:DX -> function table
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC02h
--------s-2FBC04-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET DMA AND IRQ CHANNELS
    AX = BC04h
Return: AX = 4D56h ('MV')
    BL = DMA channel
    CL = IRQ number
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC01h"MVSOUND"
--------V-2FBC06-----------------------------
INT 2F U - MS Windows 3.0, DOS 5+ EGA.SYS - GET VERSION INFO
    AX = BC06h
Return: BX = 5456h ("TV")
    CH = major version
    CL = minor version
    DL = revision
SeeAlso: AX=BC00h"EGA",INT 10/AH=FAh"EGA"
--------s-2FBC06-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET STATUS STRING
    AX = BC06h
Return: AX = 4D56h ('MV')
    DX:BX -> status string (first byte 0Ch if no status message to display)
SeeAlso: AX=BC00h/BX=3F3Fh,AX=BC01h"MVSOUND",AX=BC0Bh"MVSOUND"
--------s-2FBC0B-----------------------------
INT 2F - MediaVision MVSOUND.SYS - GET EXECUTABLE PATH
    AX = BC0Bh
Return: BX:DX -> ASCIZ path for MVPROAS.EXE, 0000h:0000h if not available
SeeAlso: AX=BC00h/BX=3F3Fh
--------U-2FBE00-----------------------------
INT 2F - REDVIEW - INSTALLATION CHECK
    AX = BE00h
Return: AL = FFh if installed
Program: REDVIEW is a public-domain TSR by Alexandr Novy and Petr Horak which
      copies data sent to standard output to standard error when the
      former has been redirected to a file, thus allowing the data to
      be seen on the screen at the same time it is captured in a file
--------N-2FBF00-----------------------------
INT 2F - PC LAN PROGRAM REDIRIFS.EXE internal - INSTALLATION CHECK
    AX = BF00h
Return: AL = FFh if installed
--------N-2FBF01-----------------------------
INT 2F U - PC LAN PROGRAM REDIRIFS.EXE internal - ???
    AX = BF01h
    ???
Return: ???
--------N-2FBF80-----------------------------
INT 2F - PC LAN PROG REDIR.SYS internal - SET REDIRIFS ENTRY POINT
    AX = BF80h
    ES:DI -> FAR entry point to IFS handler in REDIRIFS
Return: AL = FFh if installed
        ES:DI -> internal workspace
Note:    all future IFS calls to REDIR.SYS are passed to the ES:DI entry point
--------F-2FC0-------------------------------
INT 2F - MTEZ XpressFax Hardware TSR (CLASS2) - API
    AH = C0h
    AL = function code (01h to 15h)
Return: ???
SeeAlso: AX=C000h/BX=444Bh,AX=CB00h/BX=4D53h
--------N-2FC000-----------------------------
INT 2F - Novell ODI Link Support Layer (LSL.COM) - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        DX:BX -> FAR entry point (see #2152,#2153,#2154)
        ES:SI -> signature string "LINKSUP$"
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    on return, ES = DX for LSL v1.10 and v2.05; LSL makes use of this in
      its search for a previous installation
SeeAlso: AX=5100h,AX=C000h"NESL"

(Table 2152)
Call LSL function "Request MLID Registration" with:
    BX = 0001h
    ES:SI -> registration??? record (see #2156)
    DS:DI -> buffer for LSL information block (see #2157)
Return: AX = completion code (0000h,8001h) (see #2155)
    DS:DI buffer filled if successful
    BX,CX corrupted
Note:    see "Novell LAN Driver Developer's Guide, Volume III" for more details

(Table 2153)
Call LSL function "get support entry points" with:
    BX = 0002h
    ES:SI -> buffer for entry point record (see #2158)
Return: ES:SI buffer filled

(Table 2154)
Call LSL function "Request MLID API entry point" with:
    BX = 0003h
Return: ES:SI -> MLID (Multiple Link Interface Driver) API entry point
        (call with BX=function 00h-10h, not range-checked)
Note:    LSL v1.10 and v2.05 execute BX=0003h for BX=0000h and any BX >= 0003h

(Table 2155)
Values for LSL completion code:
 0000h    successful
 8001h    out of resources
 8002h    bad parameter
 8003h    no more items
 8004h    item not present
 8005h    failed
 8006h    receive overflow
 8007h    canceled
 8008h    bad command
 8009h    duplicate entry
 800Ah    no such handler
 800Bh    no such driver

Format of LSL registration record:
Offset    Size    Description    (Table 2156)
 00h    DWORD    -> ??? FAR function (to be called with ES:SI -> ??? and
          returning AX = completion code)
 04h    DWORD    -> ???
 08h    DWORD    -> ??? data (at least 3Eh bytes)

Format of LSL information block:
Offset    Size    Description    (Table 2157)
 00h    DWORD    -> ??? entry point (called with BX=function 00h-11h)
 04h    WORD    ???
 06h    WORD    ???
Note:    due to a fencepost error, LSL v2.05 (distributed with Novell DOS 7)
      will crash if the above entry point is called with BX=0012h

Format of entry point record:
Offset    Size    Description    (Table 2158)
 00h    DWORD    pointer to protocol support entry point in LSL (see #2159)
 04h    DWORD    pointer to general support entry point in LSL (see #2160)

(Table 2159)
Call protocol support entry point with:
    BX = function number
        0000h ???
        0001h ???
        0002h ???
        0003h "ScheduleAESEvent"
        ES:SI -> AES ECB to be scheduled (see #2163)
        Return: ES,SI preserved
        0004h "CancelAESEvent"
        ES:SI -> ECB to be cancelled (see #2163)
        Return: ES,SI preserved
        0005h "GetIntervalMarker"
        Return: DX:AX = current interval marker in milliseconds
            all other registers preserved
        0006h "RegisterStack"
        AX = logical board number
        ES:SI -> bound stack info structure (see #2173)
        Return: BX = assigned Stack ID if AX=0000h
        0007h "DeRegisterStack"
        AX = protocol stack's assigned Stack ID
        0008h "RegisterDefaultStack"
        AX = logical board number
        ES:SI -> stack info structure (see #2174)
        0009h "DeRegisterDefaultStack"
        AX = logical board number
        000Ah "RegisterPrescanStack"
        AX = logical board number
        ES:SI -> stack info structure (see #2174)
        000Bh "DeRegisterPrescanStack"
        AX = logical board number
        000Ch "SendPacket"
        ES:SI -> send ECB
        Return: interrupts disabled
        000Dh ???
        000Eh ???
        000Fh ???
        0010h "GetStackIDFromName"
        ES:SI -> counted NUL-terminated protocol name (max 15 chars)
        Return: BX = Stack ID if AX=0000h
        0011h "GetPIDFromStackIDBoard"
        AX = Stack ID for protocol
        CX = logical board number
        ES:SI -> 6-byte buffer for protocol ID
        0012h "GetMLIDControlEntry"
        AX = logical board number
        Return: ES:SI -> MLID control handler (see #2161) if AX=0000h
        0013h "GetProtocolControlEntry"
        AX = Stack ID or
            FFFEh Prescan stack
                CX = logical board number
            FFFFh default protocol
                CX = logical board number
        Return: ES:SI -> protocol stack control entry point if AX=0000h
                  (see #2162)
        0014h "GetLSLStatistics"
        Return: AX = 0000h (successful)
            ZF set
            ES:SI -> LSL statistics table (see #2165)
        0015h "BindStack"
        AX = protocol stack's assigned Stack ID
        CX = logical board number
        0016h "UnbindStack"
        AX = protocol stack's assigned Stack ID
        CX = logical board number
        0017h "AddProtocolID"
        AX = frame type ID code
        ES:SI -> 6-byte protocol ID
        CX:DI -> counted NUL-terminated short protocol name (max 15 ch)
        0018h "RelinquishControl"
        Return: after LSL performs any necessary background processing
        0019h "GetLSLConfiguration"
        Return: AX = 0000h (successful)
            ZF set
            ES:SI -> LSL configuration table (see #2164)
        001Ah "GetTickMarker"
        Return: AX = number of 55ms ticks since LSL loaded
            BX destroyed
Return: AX = completion code (see #2155)
    ZF set if successful
    SS:SP, DS, BP preserved; most other registers may be destroyed

(Table 2160)
Call general support entry point with:
    BX = function number
        0000h "Allocate Memory" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0001h "Free Memory" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0002h "Realloc Memory" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0003h "Memory Statistics" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0004h "Add Memory To Pool" (obsolete)
         always returns AX=8008h (BAD_COMMAND)
        0005h "AddGeneralService"
        ES:SI -> General Service Control Block (see #2175)
        0006h "RemoveGeneralService"
        ES:SI -> General Service Control Block (see #2175)
        0007h "GetNETcfgPath"
        Return: AX = 0000h (successful)
            DS:DX -> ASCIZ pathname for NET.CFG
        0008h U ???     (in LSL 1.10)
        Return: AX = 0000h
            ES:SI -> ??? (a 22-byte data area)
        000Ah "GetCriticalSectionStatus"
        Return: BX = total outstanding calls to "StartCriticalSection"
        000Bh "ServiceEvents"
        interrupts disabled
        Return: interrupts disabled
        0010h "GetStackECB"
        DS:DI -> Lookahead structure (see #2176)
        interrupts disabled
        Return: ES:SI -> ECB if successful (AX=0000h,ZF set)
            interrupts disabled
        8000h-FFFFh reserved for user general service providers
Return: AX = completion code (see #2155)
    ZF set if successful
    SS:SP, DS, BP preserved

(Table 2161)
Call MLID control handler with:
    AX = logical board number
    BX = function number
        0000h "GetMLIDConfiguration"
        Return: ES:SI -> MLID's configuration table if successful
                  (see #2168 for format)
        0001h "GetMLIDStatistics"
        Return: ES:SI -> MLID's statistics table if successful
                  (see #2168 for format)
        0002h "AddMulticastAddress"
        ES:SI -> 6-byte multicast address to add
        0003h "DeleteMulticastAddress"
        ES:SI -> 6-byte multicast address to delete
        0005h "MLIDShutdown"
        CX = type
            0000h permanent (also deregisters from LSL)
            other temporary (shutdown hardware only)
        0006h "MLIDReset" reinitialize board / restart from temp shutdown
        0007h "Create Connection" (obsolete?)
        ???
        0008h "Delete Connection" (obsolete?)
        ???
        0009h "SetLookAheadSize"
        CX = requested lookahead size (00h-80h)
        000Ah "PromiscuousChange"
        CX = what to receive promiscuously
            bit 0: MAC frames
            bit 1: non-MAC frames
        000Bh "RegisterReceiveMonitor"
        CX = subfunction
            0000h disable receive monitoring
            else  enable receive monitoring
        ES:SI -> monitor receive routine
        ES:DI -> monitor transmit routine
        000Ch "Driver Poll" (obsolete?)
        ???
Return: AX = completion code (see #2155)
    ZF set if successful
Note:    not all boards/MLIDs support function 0010h; see bit 13 in the MLID
      mode flags field of the MLID's configuration table

(Table 2162)
Call protocol stack control entry point with:
    BX = function number
        0000h "GetProtocolStackConfiguration"
        Return: ES:SI -> protocol stack's configuration table
                   (see #2167)
        0001h "GetProtocolStackStatistics"
        Return: ES:SI -> protocol stack's statistics table (see #2166)
        0002h "BindToMLID"
        CX = board number to bind to
        ES:SI -> implementation-dependant parameter string
        0003h "UnBindFromMLID"
        CX = board number from which protocol should unbind
        ES:SI -> optional implementation-dependant parameter string
        0004h "MLIDDeRegistered"
        CX = board number that has de-registered from LSL
Return: AX = status
        0000h successful
        else implementation-dependant error codes
    ZF set if successful
    SS:SP, DS, BP preserved

Format of AES ECB:
Offset    Size    Description    (Table 2163)
 00h    DWORD    "AESLink" pointer used by LSL for list management
 04h    DWORD    number of milliseconds to wait
 08h    DWORD    "AESStatus" (is set to 00000000h when AES ESR is invoked)
 0Ch    DWORD    -> function to be invoked when time expires
        ES:SI will point to this structure on entry,
        DS, BP, and SS:SP must be preserved.
SeeAlso: #2177

Format of LSL Configuration Table:
Offset    Size    Description    (Table 2164)
 00h    BYTE    major version of configuration table
 01h    BYTE    minor version of configuration table (decimal, 0-99)
 02h  8 BYTEs    reserved
 0Ah    BYTE    LSL major version (decimal)
 0Bh    BYTE    LSL minor version (decimal, 0-99)
---LSL 1.0x ---
 0Ch 14 BYTEs    reserved
---LSL 1.10+ ---
 0Ch    WORD    maximum number of boards which LSL can handle
 0Eh    WORD    maximum number of protocol IDs which LSL can handle
 10h 12 BYTEs    reserved

Format of LSL Statistics Table:
Offset    Size    Description    (Table 2165)
 00h    BYTE    major version of statistics table format
 01h    BYTE    minor version of statistics table format (decimal, 0-99)
 02h    WORD    "GenericCounters" number of counters in static portion of
          table
 04h    DWORD    "ValidCountersMask" bit mask indicating which generic
          counters are actually used.  Bit 31 = TotalTxPackets, bit 30
          is the next field, etc.
 08h    DWORD    "TotalTxPackets" total SendPacket requests made
 0Ch    DWORD    reserved
 10h    DWORD    reserved
 14h    DWORD    "AESEventsCount" number of completed AES events
 18h    DWORD    "PostponedEvents" number of events postponed due to critical
          sections inside the MLIDs
 1Ch    DWORD    "CancelAESFailures" number of times CancelAESEvent failed
 20h    DWORD    reserved
 24h    DWORD    reserved
 28h    DWORD    "TotalRxPackets" total number of GetStackECB requests
 2Ch    DWORD    "UnclaimedPackets" total number of packets not consumed by a
          protocol stack
 30h    WORD    "NumberCustom" number of custom variables that follow
 32h  N DWORDs    custom counters
      N DWORDs    -> CustomCounterStrN (one per custom counter)
    var    length-prepended and NULL terminated string for Counter 0
    ...
    var    length-prepended and NULL terminated string for Counter N-1
SeeAlso: #2166,#2172

Format of Protocol Stack Statistics Table:
Offset    Size    Description    (Table 2166)
 00h    BYTE    statistics table major version
 01h    BYTE    statistics table minor version (decimal, 0-99)
 02h    WORD    number of generic counters following
 04h    DWORD    "ValidCountersMask" (bitmask, bit 31 is TotalTxPackets)
 08h    DWORD    TotalTxPackets
 0Ch    DWORD    TotalRxPackets
 10h    DWORD    IgnoredRxPackets
 14h    WORD    number of custom counters
 16h  N DWORDs    custom counters
      N DWORDs    -> CustomCounterStrN (one per custom counter)
    var    length-prepended and NULL terminated string for Counter 0
    ...
    var    length-prepended and NULL terminated string for Counter N-1
SeeAlso: #2165,#2172

Format of Protocol Stack Configuration Table:
Offset    Size    Description    (Table 2167)
 00h    BYTE    configuration table major version
 01h    BYTE    configuration table minor version (decimal, 0-99)
 02h    DWORD    -> counted NUL-terminated long descriptive name for protocol
 06h    DWORD    -> counted NUL-terminated short name for protocol (15 chars)
 0Ah    BYTE    protocol stack major version
 0Bh    BYTE    protocol stack minor version (decimal, 0-99)
 0Ch 16 BYTEs    reserved for future use

Format of MLID Configuration Table:
Offset    Size    Description    (Table 2168)
 00h 26 BYTEs    signature 'HardwareDriverMLID         ' (8 spaces on end)
 1Ah    BYTE    configuration table major version
 1Bh    BYTE    configuration table minor version (decimal, 0-99)
 1Ch  6 BYTEs    node address
 22h    WORD    MLID mode flags (see #2169)
 24h    WORD    board number
 26h    WORD    board instance (if more than one of same board installed)
 28h    WORD    maximum packet size
 2Ah    WORD    BestDataSize
 2Ch    WORD    WorstDataSize
 2Eh    DWORD    -> counted NUL-terminated long name for NIC
 32h    DWORD    -> counted NUL-terminated short name for NIC (8 chars max)
 36h    DWORD    -> counted NUL-terminated Frame and Media type
 3Ah    WORD    reserved (0000h)
 3Ch    WORD    frame type ID
 3Eh    WORD    TransportTime (milliseconds)
 40h    DWORD    -> SourceRouteHandler for TokenRing. (Used by ROUTE.COM)
 44h    WORD    lookahead size
 46h    WORD    line speed (Mbps if high bit clear, else Kbps)
 48h    WORD    QueueDepth
 4Ah  6 BYTEs    reserved (0)
 50h    BYTE    driver major version
 51h    BYTE    driver minor version (decimal, 0-99)
 52h    WORD    bus/multicast flags (see #2170)
 54h    WORD    send retries
 56h    DWORD    ConfigTableLink
 5Ah    WORD    MLID sharing flags (see #2171)
 5Ch    WORD    slot number
 5Eh    WORD    I/O address 1
 60h    WORD    I/O range 1
 62h    WORD    I/O address 2
 64h    WORD    I/O range 2
 66h    DWORD    memory address 1
 6Ah    WORD    memory size 1
 6Ch    DWORD    memory address 2
 70h    WORD    memory size 2
 72h    BYTE    interrupt line 1
 73h    BYTE    interrupt line 2
 74h    BYTE    DMA line 1
 75h    BYTE    DMA line 2

Bitfields for MLID mode flags:
Bit(s)    Description    (Table 2169)
 15    MLID supports Octet Reversal
 14    node address is non-canonical
 13    promiscuous mode is supported
 12-8    reserved
 7    LDataSize field in LookAhead structure supported
 6    raw send supported
 5    MLID needs to be polled by LSL
 4    reserved (0)
 3    multicasting is supported
 2    not currently used by DOS ODI, set to 0.
 1    network card uses DMA.
 0    RealDriverBit, always set to 1.

Bitfields for bus/multicast flags:
Bit(s)    Description    (Table 2170)
 10-9    specialized multicast support
    00 = Group addressing is default for medium
    01 = Invalid
    10 = Filter group address in MLID.
    11 = Adapter filters group address.
 2    supports Micro Channel cards
 1    supports ISA cards
 0    supports EISA cards

Bitfields for MLID sharing flags:
Bit(s)    Description    (Table 2171)
 8    NIC can share DMA2
 7    NIC can share DMA1
 6    NIC can share IRQ2
 5    NIC can share IRQ1
 4    NIC can share Memory2
 3    NIC can share Memory1
 2    NIC can share IO2
 1    NIC can share IO1
 0    MLID is currently shut down

Format of MLID Statistics Table:
Offset    Size    Description    (Table 2172)
 00h    BYTE    driver statistics table major version
 01h    BYTE    driver statistics table minor version (decimal, 0-99)
 02h    WORD    number of generic counters (typically 13)
 04h    DWORD    "ValidCountersMask" (bit mask, bit 31 is TotalTxCount)
 08h    DWORD    TotalTxCount
 0Ch    DWORD    TotalRxCount
 10h    DWORD    NoECBAvailableCount
 14h    DWORD    TxTooBigCount
 18h    DWORD    TxTooSmallCount
 1Ch    DWORD    RxOverflowCount
 20h    DWORD    RxTooBigCount
 24h    DWORD    RxTooSmallCount
 28h    DWORD    TxMiscCount
 2Ch    DWORD    RxMiscCount
 30h    DWORD    TxRetryCount
 34h    DWORD    RxChecksumErrorCount
 38h    DWORD    RxMismatchCount
 3Ch    WORD    number of custom counters
 3Eh  N DWORDs    custom counters
      N DWORDs    -> CustomCounterStrN (one per custom counter)
    var    length-prepended and NULL terminated string for Counter 0
    ...
    var    length-prepended and NULL terminated string for Counter N-1
SeeAlso: #2165,#2166

Format of bound stack info structure:
Offset    Size    Description    (Table 2173)
 00h    DWORD    -> protocol stack's short name (counted, NUL-terminated)
 04h    DWORD    -> receive handler
 08h    DWORD    -> control handler

Format of stack info structure:
Offset    Size    Description    (Table 2174)
 00h    DWORD    -> receive handler
 04h    DWORD    -> control handler

Format of General Service Control Block:
Offset    Size    Description    (Table 2175)
 00h    DWORD    -> next GSCB (maintained internally by LSL)
 04h    DWORD    -> entry point for general service handler
 08h    WORD    command code for this general service (8000h-FFFFh)
Note:    the control block must not be altered or deallocated until the general
      service is removed

Format of Lookahead structure:
Offset    Size    Description    (Table 2176)
 00h    DWORD    -> Media header
 04h    DWORD    -> lookahead buffer
 08h    WORD    length of lookahead buffer
 0Ah  6 BYTEs    protocol ID
 10h    WORD    logical board number
 12h    WORD    lookahead size

Format of ODI ECB:
Offset    Size    Description    (Table 2177)
 00h    DWORD    link to next ECB
 04h    DWORD    link to previous ECB
 08h    WORD    general status
        0000h received successfully
        8006h packet overflow
        8007h reception aborted (data not valid)
 0Ah    DWORD    -> event service routine or RETF (never 0000h:0000h)(see #2178)
 0Eh    WORD    protocol stack identifier
 10h  6 BYTEs    protocol ID (sending only)
 16h    WORD    MLID board number (sending only)
 18h  6 BYTEs    MAC destination address
 1Eh  4 BYTEs    driver workspace
 22h  4 BYTEs    protocol workspace
 26h    WORD    total length of sent buffer
 28h    WORD    fragment count
 2Ah  2 WORDs    segment,offset of first fragment buffer
 2Eh    WORD    length of first fragment buffer
    ...
SeeAlso: #2163

(Table 2178)
Values event service routine is called with:
    ES:SI -> associated ODI ECB (see #2177)
    interrupts disabled
Return: DS,BP,SS,SP preserved
    interrupt disabled
Notes:    the service routine may invoke any IPX/ODI function except CloseSocket
    it is safe to send a packet and wait for completion if enough stack
      space is available
--------N-2FC000-----------------------------
INT 2F - Novell NetWare Event Service Layer (NESL) 1.0 - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        DX:BX -> FAR entry point (see #2179,#2180,#2181,#2182,#2183,#2184)
        ES:SI -> signature string "NESL_EVENTS"
Program: NESL is a generic interface for event handling in ODI drivers and
      other NetWare-oriented modules.  Primarily intended to support
      power management and "hot swapping" of PCMCIA cards, but it is not
      limited to this.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"Link Support Layer",AX=C000h"NETWARN"

(Table 2179)
Call NESL function GetNESLConfigPointer with:
    BX = 0000h
Return: AX = completion code (0000h,8008h) (see #2185)
    ES:SI -> NESL configuration table if successful (see #2186)
    BP,DS,STACK preserved
Desc:    Obtain a pointer to the NESL Configuration Table
SeeAlso: #2180,#2183

(Table 2180)
Call NESL function RegisterEventProducer with:
    BX = 0001h
    ES:SI -> Producer Event Control Block (PECB) (see #2187)
Return: AX = completion code (0000h, 8005h, 8008h) (see #2185)
    ES:SI -> still points to PECB
    BP,DS,STACK preserved
Desc:    Allows a module to register as a producer of a given event class
Note:    PECB_ClassName and PECB_Flags must be filled in on entry
SeeAlso: #2053,#2181,#2182,#2183

(Table 2181)
Call NESL function DeRegisterEventProducer with:
    BX = 0002h
    ES:SI -> PECB previously passed to RegisterEventProducer (see #2187)
Return: AX = completion code (0000h, 8002h, 8008h) (see #2185)
    ES:SI -> still points to PECB
    BP,DS,STACK preserved
Desc:    Allows a module to de-register as a producer of a given event class
SeeAlso: #2180,#2184

(Table 2182)
Call NESL function EventNotification with:
    BX = 0003h
    ES:SI -> PECB previously registered (see #2187)
Return: AX = completion code (0h, 8005h, 8008h) (see #2185)
    ES:SI -> still points to PECB
    BP,DS,STACK preserved
Desc:    Allows a module to signal that an event has just occurred in a given
      event class.
Notes:    Once called, NESL will generate corresponding callouts for this
      event, as described in Table #2189.
    on entry, the PECB_DataPtr must point at an Event Parameter Block (EPB)
      (see #2190) filled in to match the desired event
SeeAlso: #2180

(Table 2183)
Call NESL function RegisterEventConsumer with:
    BX = 0004h
    ES:SI -> Consumer Event Control Block (CECB) (see #2188)
Return: AX = completion code (0h, 8005h, 8008h) (see #2185)
    ES:SI -> still points to CECB
    BP,DS,STACK preserved
Desc:    Allows a module to register as a consumer of a given event class
Note:    on entry, the CECB_ClassName, CECB_NotifProc and CECB_OSILevel must be
      filled in.
SeeAlso: #2180,#2184

(Table 2184)
Call NESL function DeRegisterEventConsumer with:
    BX = 0005h
    ES:SI -> CECB previously passed to RegisterEventConsumer (see #2188)
Return: AX = completion code (0h, 8002h, 8008h) (see #2185)
    ES:SI -> still points to CECB
    BP,DS,STACK preserved
Desc:    Allows a module to de-register as a consumer of a given event class
SeeAlso: #2181,#2183

(Table 2185)
Values for NESL Error code:
 0000h    Successful
 8002h    Bad Parameter
 8005h    Fail
 8008h    Bad Command

Format of NESL Configuration Table:
Offset    Size    Description    (Table 2186)
 00h    WORD    NESL_Cfg_MajVer     Major Version of this table (=1)
 02h    WORD    NESL_Cfg_MinVer     Minor Version of this table (=0)
 04h    DWORD    NESL_Cfg_ModLName   -> ASCIZ long name of NESL module
        (typically -> "NetWare Event Service Layer for 16-Bit DOS")
 08h    DWORD    NESL_Cfg_ModSName   -> ASCIZ short name of NESL module
        (typically -> "NESL")
 0Ch    WORD    NESL_Cfg_ModMajVer  Major Version of NESL itself (=1)
 0Eh    WORD    NESL_Cfg_ModMinVer  Minor Version of NESL itself (=0)

Format of NESL Producer Event Control Block (PECB):
Offset    Size    Description    (Table 2187)
 00h    WORD    PECB_MajVer  Major Version of this structure (=1)
 02h    WORD    PECB_MinVer  Minor Version of this structure (=0)
 04h    DWORD    PECB_NextProducer   -> next PECB.  NULL if last.
 08h    DWORD    PECB_ClassName        -> ASCIZ string identifying event
                      class (see #2191)
 0Ch    DWORD    PECB_ConsumerList   -> list of consumers for this event class
 10h    DWORD    PECB_DataPtr        -> points to additional data during events
 14h    DWORD    PECB_Flags
        Bit 0    =0  consumers should be called "top down" for this
                event class.  (OSI level 7 down to OSI level 1)
            =1  consumers should be called "bottom up"
        Bits 1-31   Reserved =0
 18h  8 BYTEs    PECB_Reserved (all zeros)
Note:    Although the event producer provides the memory for the PECB, the
      NESL module controls this memory until the event class is
      de-registered.
    While owned by NESL, this structure should be treated as read-only,
      except for the PECB_DataPtr field.

Format of NESL Consumer Event Control Block (CECB):
Offset    Size    Description    (Table 2188)
 00h    WORD    CECB_MajVer  Major Version of this structure (=1)
 02h    WORD    CECB_MinVer  Minor Version of this structure (=0)
 04h    DWORD    CECB_NextConsumer   -> next CECB.  NULL if last.
 08h    DWORD    CECB_ClassName        -> ASCIZ string identifying event
                      class (see #2191)
 0Ch    DWORD    CECB_NotifProc        -> FAR CALL event handler (see #2189)
 10h    WORD    CECB_OSILevel
        Bits 4-7 = OSI Layer of this module (1 through 7)
        Bits 0-3 = relative ordering with other modules on same layer
 13h 14 BYTEs    CECB_Reserved (all zeros)
Note:    Although the event consumer provides the memory for the CECB, the
      NESL module controls this memory until the consumer is de-registered.
    While owned by NESL, this structure should be treated as read-only,

(Table 2189)
Values NESL Consumer Notification Procedure is called with:
    ES:SI -> Event Parameter Block (EPB) (see #2190)
Return: AX = completion code (0000h, 8005h) (see #2185)
    ES:SI -> still points to EPB
Desc:    Called by NESL to notify the consumer when an event has occurred in
      an event class for which it has registered.
SeeAlso: #2188

Format of NESL Event Parameter Block (EPB):
Offset    Size    Description    (Table 2190)
 00h    WORD    EPB_MajVer  Major Version of this structure (=1)
 02h    WORD    EPB_MinVer  Minor Version of this structure (=0)
 04h    DWORD    EPB_ClassName  -> ASCIZ string identifying event class
                  (see #2191)
 08h    DWORD    EPB_EventName  -> ASCIZ string identifying event within
                  class (see #2192)
 0Ch    DWORD    EPB_ModuleName -> ASCIZ string identifying module
                  producing event
 10h    DWORD    EPB_DataPtr0   -> event-defined data or NULL if not used
 14h    DWORD    EPB_DataPtr1   -> event-defined data or NULL if not used
 18h  8 BYTEs    EPB_Reserved (all zeros)

(Table 2191)
Values for NESL Event Class Names:
 Event Class        Description
 -------------------    -----------------------------------------
 Service Suspend    Suspension of a service.  Called top-down.
 Service Resume        Resumption/availability of a service. Called bottom-up.
 Service/Status Change    Change in status or level of service.  Called top-down.
 Suspend Request    Request to suspend a service.  Called bottom-up.
Note:    Contact Novell Labs to register new event classes.

(Table 2192)
Values for NESL Event Names:
 Event Name            Class            Description
 --------------------------    -------------        ---------------------------
 MLID Cable Disconnect        Service Suspend        Cable disconnected from NIC
 MLID Card Removal        Service Suspend        PCMCIA card removed
 MLID Hardware Failure        Service Suspend        Serious hardware
                              failure in NIC
 MLID Not In Range        Service Suspend        Wireless access point
                              is out of range
 MLID Shutdown            Service Suspend        MLID was shut down
 MLID Media Access Denied    Service Suspend        Access to physical
                              medium unsuccessful
 MLID Cable Reconnect        Service Resume        Cable re-connected to NIC
 MLID Card Insertion Complete    Service Resume        PCMCIA card inserted
 MLID In Range            Service Resume        Wireless access point
                              in range
 MLID Reset            Service Resume        MLID was just reset
 MLID Access Point Change    Serv/Status Change  Station has moved to
                              new access point
 MLID Speed Change        Serv/Status Change  Change in communic. speed
Note:    Contact Novell Labs to register new event names.
    For all predefined events above, EPB_DataPtr0 (see #2190) points
      to the MLID Configuration table (see AX=C000h"ODI") for the
      affected MLID.
--------N-2FC000-----------------------------
INT 2F - Novell NetWare Connect NETWARN - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        SI = segment of resident portion
Program: NETWARN is a utility supplied with NetWare Connect to warn a
      remote dialup user when programs are about to be loaded slowly over
      the modem link.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    on return, verify that it is NETWARN responding by examining signature
      at in NETWARN's data table in the resident segment (see #2193)
SeeAlso: AX=C000h"ODI",AX=C000h"NESL"

Format of NETWARN Configuration structure:
Offset    Size    Description    (Table 2193)
 103h 7 BYTEs    signature string "NETWARN"
 10Ah    BYTE    major version in ASCII (="1")
 10Bh    BYTE    minor version in ASCII (="0")
 10Ch    DWORD    minimum size of EXE cared about in bytes (/S=xxxx)
 110h    WORD    same value in kilobytes (see 0113h, bit 4 below)
 112h    BYTE    multiplex code (AH value) actually being used
 113h    WORD    options (see #2194)
 115h    DWORD    INT 21h vector before NETWARN loaded
 119h    DWORD    INT 2Fh vector before NETWARN loaded
 11Dh 16 BYTEs    ASCIIZ local name of last device which was checked
 12Dh 128 BYTEs ASCIIZ remote name of last device which was checked
Note:    the specified offsets are from the start of the resident segment

Bitfields for NETWARN options:
Bit(s)    Description    (Table 2194)
 0    ??? (=0)
 1    /U (Unload) selected (never in resident)
 2    /E (Enabled) Will trap & check EXEC's
 3    /D (Disabled) No EXEC checking done
 4    /S (Size) was set (see 010Ch, 0110h above)
 5    /P (Path shown)
 6    /H or /? (Help) (never in resident)
SeeAlso: #2193
--------f-2FC000-----------------------------
INT 2F - FN32 32 character filename utilities - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
       ES:DI -> signature string "FN32 32CHAR TSR"
Program: FN32 is a TSR which supports 32 character filenames under PC/MS-DOS
Note:    the TSR intercepts INT 21 calls and performs filename substitution by
      managing dictionary files in each directory which contains long
      filenames
--------M-2FC000-----------------------------
INT 2F - QMR - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        ES:DI -> signature string "QMR1!"
Program: QMR (Cove Software, Quick Mouse Reset) monitors the mouse
      service interrupt (int 33h) and substitutes a fast software
      reset (mouse fn 21h) for the slow hardware reset (mouse fn 0).
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C001h"QMR",AX=C002h"QMR",AX=C003h"QMR"
--------V-2FC000-----------------------------
INT 2F - VGAsave v1.93 - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        BX = segment of resident code
Program: VGAsave is a freeware VGA-specific, mouse-aware screenblanker by Bill
      Javurek
Range:    AH=C0h to AH=FFh, selected by scanning for a free multiplex number
Note:    the transient portion of VGAsave compares the first 38 bytes of the
      resident code (addressed through BX) against its own copy of the
      resident code to complete the installation check
SeeAlso: INT 14/AX=AA01h,INT 2F/AH=93h
Index:    screen saver;VGAsave
--------V-2FC000-----------------------------
INT 2F - AD-DOS - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        BX = 4144h ('AD')
        CX = 2D44h ('-D')
        DX = 4F53h ('OS')
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C001h,AX=C003h,AX=C005h,AX=C007h,AX=C009h,AX=C020h,INT 14/AX=AA01h
Index:    screen saver;AD-DOS
--------U-2FC000-----------------------------
INT 2F U - WANG_ER.COM - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        ES = segment of resident code
Program: WANG_ER is a TSR from Compaq which permits Compaq systems equipped
      with 3-mode floppy drives to read Wang document diskettes
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    The installation check is completed by comparing the resident code
      with the copy in the transient program
--------i-2FC000-----------------------------
INT 2F O - ASPIHOOK.SYS - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if multiplex number in use
        ES:DI -> ASCIZ signature "ASPIHOOK" if ASPIHOOK.SYS installed
Program: ASPIHOOK is a device driver for monitoring SCSI activity through an
      ASPI host manager; it is part of the Personal Measure system
      activity monitor from Spirit of Performance, Inc.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"PMEASURE"
--------i-2FC000-----------------------------
INT 2F - PMEASURE.EXE - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if multiplex number in use
        ES:DI -> ASCIZ signature "PMEASURE.EXE" if PMEASURE.EXE installed
Program: PMEASURE.EXE is a TSR for monitoring system hardware activity which
      is part of the Personal Measure system activity monitor from Spirit
      of Performance, Inc.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    If a Personal Measure Hook Module, such as ASPIHOOK.SYS, is already
      installed, PMEASURE.EXE uses the next highest free multiplex number.
SeeAlso: AX=C000h"ASPIHOOK",AX=C000h"PERSONAL MEASURE"
--------i-2FC000-----------------------------
INT 2F - PERSONAL MEASURE - HOOK MODULE INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
    ES:DI -> signature string "PMEASUREHOOK"
    AX = C000 if not installed, per mux id conventions
    DH = major release number (binary)
    DL = minor release number (binary)
Program: The Personal Measure system activity monitor from Spirit of
      Performance, Inc. uses an extensible series of modules to hook
      into various operating system interfaces and monitor system calls.
      Current hook modules are ASPIHOOK.SYS for ASPI device activity
      and CDRHOOK.SYS for non-ASPI CD-ROM activity.     All hook modules
      share the same mux id.
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"PMEASURE.EXE",AX=C001h"PERSONAL MEASURE"
--------c-2FC000-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        SI = signature value 20D6h
        DI = signature value 8761h
        ES:BX -> configuration table (see #2195)
        CX = ??? (0300h)
        DX = ??? (0020h)
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=0100h/SI=20D6h,AX=C001h"PCACHE"

Format of PrintCache configuration table:
Offset    Size    Description    (Table 2195)
 00h 26 BYTEs    ASCIZ signature string "TORQ Configuration Table: "
 1Ah  2 BYTEs    ???
 1Ch    DWORD    -> data table (see #2196)
 20h  4 BYTEs    ASCIZ version string ("3.1" for v3.1)
 24h  5 BYTEs    ???
 29h 12 BYTEs    ASCIZ version date string ("Aug 31 1993" for v3.1)
 35h    WORD    buffered port type (01h = LPT, 02h = COM)
 37h    WORD    buffered port BIOS port number
 39h  5 BYTEs    ASCIZ buffered port name ("LPTn" or "COMn")
 3Eh    WORD    physical port type (01h = LPT, 02h = COM)
 40h    WORD    physical port BIOS port number
 42h  5 BYTEs    ASCIZ physical port name ("LPTn" or "COMn")
 47h    BYTE    port driver IRQ
 48h 21 BYTEs    ???
 5Dh    WORD    buffer size in K
 5Fh 27 BYTEs    ???
 7Ah    BYTE    popup hotkey shift states (see #0465 at INT 16/AH=02h)
 7Bh    BYTE    popup hotkey scan code (see #0005 at INT 09h"IRQ1")
 7Ch  4 BYTEs    ???
 80h 20 BYTEs    ASCIZ printer type name
    ???

Format of PrintCache data table:
Offset    Size    Description    (Table 2196)
 00h  2 BYTEs    ???
 02h    DWORD    -> ??? entry point
    ???
--------U-2FC000-----------------------------
INT 2F - Frank Kintrup TSR Utilities - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        BX = program ID (see #2197)
        CX = 464Bh (signature "FK")
        DX = revision number (DH = major, DL = minor)
        ES = resident segment of TSR
Range:    AH=C0h to AH=FFh, selected by searching for a free multiplex number
SeeAlso: AX=C001h"Kintrup",AX=C002h"Kintrup"

(Table 2197)
Values for Frank Kintrup TSR program ID:
 4153h    "AS"    ASCII.COM    ASCII table with paste function
 434Ch    "CL"    CLOCK.COM    clock with date/time display and alarm
 5043h    "PC"    PCALC.COM    programmer's calculator with paste function
 5343h    "SC"    SCRSAVE.COM    screen saver with mouse support and hotkey
 5544h    "UD"    UNDEL.COM    undelete program like SMARTCAN or DPROTECT
--------K-2FC000-----------------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if possibly installed
Range:    AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C001h"HP 100LX",AX=C0AEh"HP 100LX",AX=C0AFh"HP 100LX"
--------V-2FC000-----------------------------
INT 2F - DIMWIT - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if installed
        ES:DI -> signature string "DIMDOS" or "DIMWIN"
Program: DIMWIT is a freeware Windows-aware screen blanker by Larry Board
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"AD-DOS",AX=C001h"DIMWIT"
Index:    screen saver;DIMWIT
--------F-2FC000BX444B-----------------------
INT 2F - MTEZ XpressFax Hardware TSR (CLASS2) - INSTALLATION CHECK
    AX = C000h
    BX = 444Bh ('DK')
    CX = 4A4Eh ('AN')
Return: AL = status
        00h not installed, OK to install
        FFh installed
        BX = 646Bh ('dk')
        CX = 6A6Eh ('an')
Range:    AH=C0h to AH=FFh, selected automatically
SeeAlso: AH=C0h"MTEZ"
--------V-2FC000-----------------------------
INT 2F U - TSENGP.COM - INSTALLATION CHECK
    AX = C000h
Return: AL = status
        00h not installed, OK to install
        FFh installed
        DS = segment of resident code
Program: TSENGP.COM is a TSR supplied by Compaq to fix an incompatibility
      between some applications and Tseng ET4000-based video adapters
Range:    AH=C0h to AH=FFh, selected automatically
Note:    the installation check is completed by comparing the first eleven
      bytes at DS:005Fh against the TSR's code (80h FCh 06h 74h 0Ah
      80h FCh 07h 74h 05h EAh)
--------N-2FC000-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - INSTALLATION CHECK
    AX = C000h
Return: AL = FFh if one of the components is installed
    CX:BX -> signature within LLRA component:
        "TSI_LapLinkCore" for LLRA1.EXE
        "TSI_Blackbird"   for LLRA2.EXE
        "TSI_Redirector"  for LLRA3.EXE
        "TSI_Compression" for LLRA4.EXE
    DL = major version number
    DH = minor version number
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    LapLink components are installed in the order listed above, but not
      necessarily all four; each gets its own multiplex number (default
      C0h-C3h)
SeeAlso: AX=C002h"LapLink",AX=C205h"LapLink",AX=C2F0h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink",AX=C3F0h"LapLink"
SeeAlso: AX=C3F1h"LapLink"
--------M-2FC001-----------------------------
INT 2F - QMR - REQUEST HARDWARE RESET
    AX = C001h
Return: ES = QMR code segment
    AL destroyed
Desc:    this function is used to force a full mouse reset when QMR is installed
SeeAlso: AX=C000h"QMR",AX=C002h"QMR"
--------V-2FC001-----------------------------
INT 2F - DIMWIT - GET CONFIGURATION DATA
    AX = C001h
Return: ES:DI -> TSR configuration data (see #2198)
Program: DIMWIT is a freeware Windows-aware screen blanker by Larry Board
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"DIMWIT",AX=C001h"AD-DOS"
Index:    screen saver;DIMWIT

Format of DIMWIT TSR configuration data:
Offset    Size    Description    (Table 2198)
 00h    WORD    blanking delay in clock ticks
 02h    BYTE    instant-blanking hotkey scan code (see #0005)
        Ctrl and Alt must also be pressed
--------V-2FC001ES0000-----------------------
INT 2F - AD-DOS - GET RESIDENT CODE SEGMENT
    AX = C001h
    ES = 0000h
Return: AL = 00h if successful
        ES = AD-DOS TSR Code Segment
SeeAlso: AX=C000h"AD-DOS",AX=C001h"DIMWIT"
Index:    screen saver;AD-DOS
--------c-2FC001-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ENTRY POINTS
    AX = C001h
Return: AL = FFh if installed
        ES:BX -> ???
        ES:DX -> ???
        ES:SI -> ???
        ES:DI -> ??? (equivalent to AX=C002h)
SeeAlso: AX=C000h"PCACHE",AX=C002h"PCACHE"
--------U-2FC001-----------------------------
INT 2F - Frank Kintrup TSR Utilities - CLOCK - DISABLE DISPLAY UPDATE
    AX = C001h
Range:    AH=C0h to AH=FFh, selected by searching for a free multiplex number
SeeAlso: AX=C000h"Kintrup",AX=C002h"Kintrup"
--------K-2FC001CX03FB-----------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INTERNAL - UNINSTALL
    AX = C001h
    CX = 03FBh return address to continue uninstall if possible
Return: program uninstalled
Range:    AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C000h"HP 100LX",AX=C0AEh"HP 100LX",AX=C0AFh"HP 100LX"
--------i-2FC001-----------------------------
INT 2F - PERSONAL MEASURE - PASS PARAMETERS TO HOOK MODULE(S)
    AX = C001h
    DX = segment of PMEASURE.EXE or 0000h
    BX = offset in PMEASURE.EXE or 0000h
    CX = offset in PMEASURE.EXE or 0000h
Return: None
Program: PMEASURE.EXE is a TSR for monitoring system hardware activity which
      is part of the Personal Measure system activity monitor from Spirit
      of Performance, Inc.    PMEASURE uses this call to inform its hook
      modules whether or not it is running and to pass information about
      shared data and procedures.
Warning: This information documents a function that is private to Personal
      Measure and is provided as information only.    It should NOT be called
      by any software other than Personal Measure.
SeeAlso: AX=C000h"PERSONAL MEASURE HOOK MODULE"
--------V-2FC002-----------------------------
INT 2F - AD-DOS - CHECK FOR NEW INPUT
    AX = C002h
Return: AL = 00h if successful
        BX = status
        0000h no input since last check
        0001h new input available
Note:    this call also resets the new-input flag
SeeAlso: AX=C000h"AD-DOS",AX=C004h
Index:    screen saver;AD-DOS
--------M-2FC002-----------------------------
INT 2F - QMR - DISABLE QMR
    AX = C002h
Return: ES = QMR code segment
    AL destroyed
Desc:    this call temporarily disables QMR
SeeAlso: AX=C000h"QMR",AX=C003h"QMR"
--------c-2FC002-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET BUFFER SIZE
    AX = C002h
Return: AX = ??? in K
    BX = size of print buffer in K
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
SeeAlso: AX=C000h"PCACHE"
--------U-2FC002-----------------------------
INT 2F - Frank Kintrup TSR Utilities - CLOCK - ENABLE DISPLAY UPDATE
    AX = C002h
Range:    AH=C0h to AH=FFh, selected by searching for a free multiplex number
SeeAlso: AX=C000h"Kintrup",AX=C002h"Kintrup"
--------N-2FC002-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Core - ???
    AX = C002h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C2F0h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink"
--------V-2FC003-----------------------------
INT 2F - AD-DOS - SET MINUTES TO WAIT
    AX = C003h
    BX = minutes to wait before blanking screen
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    this call also resets the delay timer
SeeAlso: AX=C000h"AD-DOS",AX=C004h
Index:    screen saver;AD-DOS
--------M-2FC003-----------------------------
INT 2F - QMR - ENABLE QMR
    AX = C003h
Return: ES = QMR code segment
    AL destroyed
Desc:    this call enables QMR after it has been disabled
SeeAlso: AX=C000h"QMR",AX=C002h"QMR"
--------c-2FC003-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ??? FLAG
    AX = C003h
Return: BX destroyed
SeeAlso: AX=C004h"PCACHE"
--------V-2FC004-----------------------------
INT 2F - AD-DOS - GET MINUTES TO WAIT
    AX = C004h
Return: AL = 00h if successful
        BX = minutes to wait before blanking screen
SeeAlso: AX=C000h"AD-DOS",AX=C003h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC004-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - CLEAR ??? FLAG
    AX = C004h
Return: BX destroyed
SeeAlso: AX=C003h"PCACHE"
--------V-2FC005-----------------------------
INT 2F - AD-DOS - SET BLANKER STATUS
    AX = C005h
    BX = new state (0000h inactive, 0001h active) (default 0001h)
Return: AL = 00h if successful
SeeAlso: AX=C006h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC005-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C005h
    ???
Return: BX destroyed
    ???
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------V-2FC006-----------------------------
INT 2F - AD-DOS - GET BLANKER STATUS
    AX = C006h
Return: AL = 00h if successful
        BX = current state of screen blanker (0000h inactive, 0001h active)
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"AD-DOS",AX=C005h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC006-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C006h
    ???
Return: BX destroyed
    ???
Note:    this function appears to be identical to AX=C007h
SeeAlso: AX=C000h"PCACHE",AX=C007h"PCACHE"
--------V-2FC007-----------------------------
INT 2F - AD-DOS - SET HOT KEY
    AX = C007h
    BX = hot key
    CL = hot key shift status
Return: AL = 00h if successful
SeeAlso: AX=C008h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC007-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C007h
    ???
Return: BX destroyed
    ???
Note:    this function appears to be identical to AX=C006h
SeeAlso: AX=C000h"PCACHE",AX=C006h"PCACHE"
--------V-2FC008-----------------------------
INT 2F - AD-DOS - GET CURRENT HOT KEY
    AX = C008h
Return: AX = status
        0000h successful
        BX = Hot Key
        CL = Hot Key Shift Status
        0008h otherwise
SeeAlso: AX=C000h"AD-DOS",AX=C007h"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC008-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - CLEAR ??? FLAG
    AX = C008h
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C009h"PCACHE"
--------V-2FC009-----------------------------
INT 2F - AD-DOS - UNBLANK MONITOR
    AX = C009h
Return: AL = 00h if successful
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    this function works by simulating keyboard activity
Index:    screen saver;AD-DOS
--------c-2FC009-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ??? FLAG
    AX = C009h
Return: BX destroyed
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE",AX=C008h"PCACHE"
--------V-2FC00A-----------------------------
INT 2F - AD-DOS - ???
    AX = C00Ah
Return: AX = status
        0000h successful
        BH = ??
        BL = ??
        000Ah failed
Index:    screen saver;AD-DOS
--------c-2FC00A-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C00Ah
    ???
Return: AH = bit flags
        bit 5: ???
    AL = bit flags
        bit 4: ???
        bit 3: ???
    BX destroyed
    ???
SeeAlso: AX=C000h"PCACHE"
--------V-2FC00B-----------------------------
INT 2F - AD-DOS - ???
    AX = C00Bh
Return: AX = status
        0000h successful
        000Bh failed
Index:    screen saver;AD-DOS
--------c-2FC00B-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - NOP
    AX = C00Bh
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE"
--------V-2FC00C-----------------------------
INT 2F - AD-DOS - SET ??? INTERNAL FLAG TO 01h
    AX = C00Ch
Return: AX = status
        0000h successful
        000Ch failed
Program: AD-DOS is the DOS version of the After Dark screen blanker for
      MS Windows
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Index:    screen saver;AD-DOS
--------c-2FC00C-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C00Ch
Return: AX = ??? (0000h)
    BX = ??? (0000h)
    CX = ??? (0100h)
    DL = ???
    DH = ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC00D-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ???
    AX = C00Dh
    DL = ???
Return: BX destroyed
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------V-2FC00E-----------------------------
INT 2F - AD-DOS - SET PASSWORD STATUS
    AX = C00Eh
    BX = new state (0000h disabled, 0001h enabled)
Return: ???
SeeAlso: AX=C000h"AD-DOS",AX=C00Fh"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC00E-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - INSTALL ???
    AX = C00Eh
    ES:DX -> ???
Return: BX destroyed
Note:    ES:DX is stored internally if the variable is currently 0000h:0000h,
      but ignored if already set; a counter is incremented
SeeAlso: AX=C000h"PCACHE",AX=C00Fh"PCACHE"
--------V-2FC00F-----------------------------
INT 2F - AD-DOS - GET PASSWORD STATUS
    AX = C00Fh
Return: BX = current state (0000h disabled, 0001h enabled)
SeeAlso: AX=C00Eh"AD-DOS"
Index:    screen saver;AD-DOS
--------c-2FC00F-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - REMOVE ???
    AX = C00Fh
Return: BX destroyed
Note:    this function decrements the counter used by AX=C00Eh, and clears the
      internal pointer variable to 0000h:0000h when it reaches zero
SeeAlso: AX=C000h"PCACHE",AX=C00Eh"PCACHE"
--------c-2FC010-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C010h
    CX = index of ??? table (00h-02h, others treated as 00h)
    SI = offset into data table
Return:    AL = byte at specified offset into table
    BX destroyed
SeeAlso: AX=C000h"PCACHE"
--------c-2FC011-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C011h
Return: AX = ??? (0007h)
    BX = ??? (0001h)
    CH = ???
    CL = ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC012-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - GET ???
    AX = C012h
Return: AX = ???
    BX = ???
    CX = ???
    DX = ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC013-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C013h
    ???
Return: BX destroyed
    ???
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------c-2FC014-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C014h
    ???
Return: BX destroyed
    ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC015-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C015h
    ???
Return: BX destroyed
    ???
SeeAlso: AX=C000h"PCACHE"
--------c-2FC016-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - INCREMENT ???
    AX = C016h
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C017h"PCACHE"
--------c-2FC017-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - DECREMENT ???
    AX = C017h
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C016h"PCACH"
--------c-2FC018-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C018h
    ???
Return: BX destroyed
    ???
Note:    the first instruction of this function is an indirect jump which points
      at a RET by default
SeeAlso: AX=C000h"PCACHE",AX=C019h"PCACHE"
--------c-2FC019-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C019h
    ???
Return: BX destroyed
    ???
Note:    the first instruction of this function is an indirect jump which points
      at a RET by default
SeeAlso: AX=C000h"PCACHE",AX=C018h"PCACHE"
--------c-2FC01A-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - CLEAR ??? FLAG
    AX = C01Ah
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C01Bh"PCACHE"
--------c-2FC01B-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - SET ??? FLAG
    AX = C01Bh
Return: BX destroyed
SeeAlso: AX=C000h"PCACHE",AX=C01Ah"PCACHE"
--------c-2FC01C-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - ???
    AX = C01Ch
    ???
Return: AX = ???
    BX destroyed
SeeAlso: AX=C000h"PCACHE"
--------c-2FC01D-----------------------------
INT 2F U - PrintCache v3.1 PCACHE.EXE - NOP
    AX = C01Dh to C01Fh
Return: BX destroyed
Program: PCACHE is the resident print spooler portion of PrintCache by
      LaserTools; it may use either memory or disk space to spool output
Range:    AH=C0h to AH=FFh, selected by commandline switch
SeeAlso: AX=C000h"PCACHE"
--------V-2FC020-----------------------------
INT 2F - AD-DOS - GET AND RESET VxD API STATUS
    AX = C020h
Return: AL = 00h if successful
        BX = VxD API Status
        0000h no error
        0001h error
        0100h neither Windows 3.X enhanced mode nor Windows/386 2.x
              is running
        0200h VM API entry point not found (VxD not installed)
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
Note:    this call resets the VxD API Status to zero
SeeAlso: AX=1602h,AX=1607h
Index:    screen saver;AD-DOS
--------V-2FC04E-----------------------------
INT 2F - Explosiv v2.00+ - NON-TSR EXECUTING CHECK
    AX = C04Eh
Return: AL = 4Fh if Explosiv is running but not memory-resident
Program: Explosiv is a shareware animated screen blanker for DOS and Windows 3
      by H&G Software (Reidar Gresseth and Chris Hook)
Range:    AH=C0h to AH=C9h, selected by configuration
SeeAlso: AX=C050h
Index:    screen saver;Explosiv
--------V-2FC050-----------------------------
INT 2F - Explosiv v2.00+ - INSTALLATION CHECK
    AX = C050h
Return: AL = 51h if installed
    ---v3.0+ ---
        BX = interval in clock ticks
        CH = animation display color (00h mono, 01h tinge, 02h color)
        CL = animation delay factor
        DH = animation parameters
        DL = INT 10 checking (00h on, 01h off)
        SI = number of bytes available for animation code
        DI = display type (00h VGA, 01h EGA, 02h CGA, 03h HGC, 04h MDA)
Program: Explosiv is a shareware animated screen blanker for DOS and Windows 3
      by H&G Software (Reidar Gresseth and Chris Hook)
Range:    AH=C0h to AH=C9h, selected by configuration
SeeAlso: AH=93h,AX=C000h"AD-DOS",AX=C04Eh,AX=C052h,AX=C054h"v3"
SeeAlso: INT 14/AX=AA01h
Index:    screen saver;Explosiv
--------V-2FC052-----------------------------
INT 2F - Explosiv v2.00+ - UNINSTALL
    AX = C052h
    DX:BX = address to return to on successful uninstall
Return: at specified address if successful
    AL = 53h on error
Note:    specified return address must have the segment of the caller's PSP
SeeAlso: AX=C050h
Index:    screen saver;Explosiv
--------V-2FC054-----------------------------
INT 2F - Explosiv v2.x - GET ANIMATION DELAY FACTOR
    AX = C054h
Return: AL = delay factor
SeeAlso: AX=C057h
Index:    screen saver;Explosiv
--------V-2FC054-----------------------------
INT 2F - Explosiv v3.0+ - UPDATE PARAMETERS
    AX = C054h
    BX = new interval in clock ticks
    CH = animation display color (00h mono, 01h tinge, 02h color)
    CL = animation delay factor
    DH = animation parameters
    DL = INT 10 checking (00h on, 01h off)
SeeAlso: AX=C050h
Index:    screen saver;Explosiv
--------V-2FC055-----------------------------
INT 2F - Explosiv v2.x - SET BLANKING INTERVAL
    AX = C055h
    BX = new interval in clock ticks
Index:    screen saver;Explosiv
--------V-2FC056-----------------------------
INT 2F - Explosiv v2.x - SET ANIMATION DISPLAY TYPE
    AX = C056h
    BL = animated display type (00h mono, 01h color)
SeeAlso: AX=C058h"v2.x"
Index:    screen saver;Explosiv
--------V-2FC056-----------------------------
INT 2F - Explosiv v3.0+ - ENABLE/DISABLE EXPLOSIV
    AX = C056h
    BX = new state
        0000h disabled
        0100h enabled
        0101h enabled, but never blank
        0102h enabled, always blank
--------V-2FC057-----------------------------
INT 2F - Explosiv v2.x - SET ANIMATION DELAY FACTOR
    AX = C057h
    BL = delay factor
SeeAlso: AX=C054h"v2.x"
Index:    screen saver;Explosiv
--------V-2FC058-----------------------------
INT 2F - Explosiv v2.x - SET ANIMATION PARAMETER
    AX = C058h
    BL = animation parameter
Note:    the animation parameter has different interpretations for each display
SeeAlso: AX=C056h"v2.x"
Index:    screen saver;Explosiv
--------V-2FC058-----------------------------
INT 2F - Explosiv v3.0+ - LOAD NEW ANIMATION DISPLAY CODE
    AX = C058h
    BX = file handle for file containing display code
    CX = number of bytes to load
    DX = offset at which animation code should be loaded
Return: AL = status (see #2199)
Note:    if AL=00h-03h on return, the file will be closed
Index:    screen saver;Explosiv

(Table 2199)
Values for Explosiv function status:
 00h    successful
 01h    code too large to available space
 02h    no data read, load aborted
 03h    incomplete load, default blanking display loaded instead
 58h    unexpected offset in DX
--------V-2FC059-----------------------------
INT 2F - Explosiv v2.x - DISABLE EXPLOSIV
    AX = C059h
Note:    clears flag set by AX=C05Ah
SeeAlso: AX=C05Ah
Index:    screen saver;Explosiv
--------V-2FC05A-----------------------------
INT 2F u - Explosiv v2.x - ENABLE EXPLOSIV
    AX = C05Ah
    BL = ???
Note:    sets flag cleared by AX=C059h then stores BL
SeeAlso: AX=C059h,AX=C05Bh
Index:    screen saver;Explosiv
--------V-2FC05B-----------------------------
INT 2F - Explosiv v2.x - CHANGE ANIMATION DISPLAY
    AX = C05Bh
    BL = animation display
Note:    this function fails silently if the requested display is not in memory
SeeAlso: AX=C05Ah,AX=C05Ch
Index:    screen saver;Explosiv
--------V-2FC05C-----------------------------
INT 2F - Explosiv v2.x - SET INT 10 CHECKING
    AX = C05Ch
    BL = new state of INT 10 checking (00h enabled, 01h disabled)
SeeAlso: AX=C05Bh
Index:    screen saver;Explosiv
--------v-2FC080-----------------------------
INT 2F U - AMI IAM.SYS - INSTALL ??? CALLBACK
    AX = C080h
    CX:DX -> ??? callback
    DI = segment of ??? buffer (first WORD copied into IAM.SYS)
Program: IAM.SYS is the Illegal Activity Monitor portion of American
      Megatrends, Inc.'s PC-Defender anti-virus product
Note:    also sets ??? flag
SeeAlso: AX=C081h

Format of IAM.SYS buffer:
Offset    Size    Description    (Table 2200)
 00h    BYTE    ???
 01h    BYTE    ???
 02h  N BYTEs    ??? (ASCIZ strings)
--------v-2FC081-----------------------------
INT 2F U - AMI IAM.SYS - CLEAR ???
    AX = C081h
Desc:    clears the ??? flag that AX=C080h sets
SeeAlso: AX=C080h
--------K-2FC0AE-----------------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INSTALLATION CHECK
    AX = C0AEh
Return: AX = 4453h if installed
    CX = 5259h if installed
Range:    AH=C0h to AH=FFh, selected by scanning for signature
SeeAlso: AX=C000h"HP 100LX",AX=C001h"HP 100LX",AX=C0AFh"HP 100LX"
--------K-2FC0AF-----------------------------
INT 2F U - HP 100LX/200LX - PUSHKEYS - INTERNAL - GET BUFFER ADDRESS
    AX = C0AFh
Return: ES:DI -> buffer (behind code)
Range:    AH=C0h to AH=FFh, selected by scanning for signature with AL=AEh
SeeAlso: AX=C000h"HP 100LX",AX=C001h"HP 100LX",AX=C0AEh"HP 100LX"
--------N-2FC100-----------------------------
INT 2F U - Personal NetWare - STPIPX v1.00 - INSTALLATION CHECK
    AX = C100h
Return: AL = FFh if installed
        ES:SI -> signature string "STP-IPX$"
        BX = version??? (0001h for v1.00)
        DI corrupted
Note:    AH=C1h is the default value; STPIPX probably scans a range of
      multiplex numbers to find a free one, as LSL does
SeeAlso: AX=C000h"LSL",AX=C101h
--------N-2FC101-----------------------------
INT 2F U - Personal NetWare - STPIPX v1.00 - UNINSTALL
    AX = C101h
Return: AL = status???
    BX corrupted
SeeAlso: AX=C101h
--------N-2FC205-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Redirector - ???
    AX = C205h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C2F0h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink"
--------N-2FC2F0-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Redirector - ???
    AX = C2F0h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F1h"LapLink",AX=C301h"LapLink"
--------N-2FC2F1-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Redirector - ???
    AX = C2F1h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C301h"LapLink"
--------d-2FC300-----------------------------
INT 2F - SETWPR.COM - INSTALLATION CHECK
    AX = C300h
Return: AL = FFh if installed
Program: SETWPR is a hard-disk write-protection TSR by Jaroslaw Rafa
SeeAlso: AX=C302h"SETWPR"
--------k-2FC300DX0000-----------------------
INT 2F U - SpaceManager - INSTALLATION CHECK
    AX = C300h
    DX = 0000h
Return: AL = FFh if any SpaceManager programs installed
        BX = 6F73h
        CX = 6F68h
Program: SpaceManager is an enhancement for MS-DOS DoubleSpace by Vertisoft
      Systems, Inc.
Range:    AH=C3h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C300h/DX=0666h
--------k-2FC300-----------------------------
INT 2F U - SpaceManager - INSTALLATION VERIFICATION
    AX = C300h
    DX = program identifier (see #2201) or 0666h for any SpaceManager prog
    BX = 4F53h ('OS')
    CX = 4F48h ('OH')
Return: AL = FFh if BX/CX as specified and specified program installed
        BX = 6F73h ('os')
        CX = 6F68h ('oh')
Range:    AH=C3h to AH=FFh, selected by scanning for first free multiplex number
Note:    this call is chained if BX,CX, or DX are not as specified above
SeeAlso: AX=C300h/DX=0000h

(Table 2201)
Values for SpaceManager program identifier:
 9000h    SMOUNT (SuperMount)
 9001h    SELECTC (SelectCompress)
 9002h    SUPERX (SuperExchange)
 9003h    FORTUNE (FortuneTeller)
--------k-2FC301-----------------------------
INT 2F U - SpaceManager - ???
    AX = C301h
    DX = program identifier (9000h,9001h,9003h) (see #2201)
    ???
Return: ???
--------N-2FC301-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Compression - ???
    AX = C301h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C3F0h"LapLink",AX=C3F1h"LapLink"
--------k-2FC302-----------------------------
INT 2F U - SpaceManager - ENABLE PROGRAM
    AX = C302h
    DX = program identifier (9000h,9001h,9003h) (see #2201)
Return: AX destroyed
SeeAlso: AX=C303h,AX=C306h
--------d-2FC302-----------------------------
INT 2F - SETWPR.COM - SET WRITE-PROTECTION STATE
    AX = C302h
    BL = new state
        00h disk may be written
        01h disk write-protected
Return: AL = FFh if installed
Program: SETWPR is a hard-disk write-protection TSR by Jaroslaw Rafa
SeeAlso: AX=C300h"SETWPR"
--------k-2FC303-----------------------------
INT 2F U - SpaceManager - DISABLE PROGRAM
    AX = C303h
    DX = program identifier (9000h,9001h,9003h) (see #2201)
Return: AX destroyed
SeeAlso: AX=C302h,AX=C306h
--------k-2FC304-----------------------------
INT 2F U - SpaceManager - GET PER-DRIVE ENABLEMENT TABLE
    AX = C304h
    DX = program identifier (9000h,9001h,9003h) (see #2201)
Return: ES:BX -> 26-byte drive table (00h disabled for drive, 01h enabled)
    AX destroyed
--------k-2FC305DX9003-----------------------
INT 2F U - SpaceManager - FORTUNE.EXE - NOP
    AX = C305h
    DX = 9003h
Return: AX destroyed
--------k-2FC305-----------------------------
INT 2F U - SpaceManager - ???
    AX = C305h
    DX = program identifier (9000h,9001h) (see #2201)
    ???
Return: ???
--------k-2FC306-----------------------------
INT 2F U - SpaceManager - CHECK WHETHER PROGRAM ENABLED
    AX = C306h
    DX = program identifier (9000h,9001h,9003h) (see #2201)
Return: AL = current state (00h disabled, FAh enabled)
    AH destroyed
SeeAlso: AX=C302h,AX=C303h
--------k-2FC307DX9001-----------------------
INT 2F U - SpaceManager - SELECTC - ???
    AX = C307h
    DX = 9001h
    BX = ???
    CX = ???
    ???
Return: ???
--------k-2FC308DX9001-----------------------
INT 2F U - SpaceManager - SELECTC - ???
    AX = C308h
    DX = 9001h
    ???
Return: ???
--------N-2FC3F0-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Compression - ???
    AX = C3F0h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C301h"LapLink",AX=C3F1h"LapLink"
--------N-2FC3F1-----------------------------
INT 2F U - LapLink RemoteAccess (LLRA) - Compression - ???
    AX = C3F1h
    details not yet available
Range:    AH=C0h to AH=FFh, selected by scanning for first free multiplex number
SeeAlso: AX=C000h"LapLink",AX=C002h"LapLink",AX=C205h"LapLink"
SeeAlso: AX=C2F0h"LapLink",AX=C301h"LapLink",AX=C3F0h"LapLink"
--------d-2FC64CBX5553-----------------------
INT 2F U - Smart Prompt - INSTALLATION CHECK
    AX = C64Ch
    BX = 5553h
Return: AX = 4CC6h if installed
    BX = 5355h if installed
Program: Smart Prompt (SMARTPMT) is a freeware TSR by Steve Gibson which forces
      an immediate flush of SmartDrive's (and compatible caches') buffers
      on returning to the DOS prompt
--------V-2FC700CX434C-----------------------
INT 2F u - COLAP - INSTALLATION CHECK
    AX = C700h
    CX = 434Ch  "CL"
Return: AL = FFh if installed
Program: colap.com is a freeware TSR by Eric Meyer which controls contrast
      and brightness of color laptops by changing the VGA palette colors;
      for Toshiba laptops there are more hotkeys for shutting off display
      and harddisk.
--------v-2FC900BP0000-----------------------
INT 2F U - ThunderByte??? - INSTALLATION CHECK
    AX = C900h
    BP = 0000h
Return: AL = FFh if installed
        BP >= 0014h
Note:    called by TBSCANX
SeeAlso: AX=C987h,AX=CA00h
--------v-2FC987-----------------------------
INT 2F U - ThunderByte??? - DISINFECT FILE???
    AX = C987h
    BX:DX -> filename
    BX:CX -> virus name
Return: AX = status
        0000h successful???
Note:    called by TBSCANX
SeeAlso: AX=CA00h
--------r-2FC9FF-----------------------------
INT 2F C - StackMan - INSTALLATION BROADCAST
    AX = C9FFh
    BL = BCD version number
    CX = number of stacks
    DX = stack size in bytes
Program: StackMan is a freeware stack manager by Franz Veldman of ESaSS B.V.
      which functions as a replacement for the DOS STACK= command as well
      as permitting multiple TSRs to share a pool of stack space
Notes:    called by StackMan when it goes resident to inform interested TSRs that
      its API is available
    the installation check consists of testing for the string "STACKXXX" at
      offset 0Ah from the INT B4 handler
SeeAlso: INT B4"StackMan",INT B5"StackMan"
Index:    installation check;STACKMAN|broadcasts;STACKMAN installation
--------F-2FCA-------------------------------
INT 2F - FAXPLUS - FAX TSR
    AH = CAh
    ???
Return: ???
Program: FAXTSR is a resident FAX send/receive module for FAXPLUS by Frans
      Veldman
SeeAlso: AH=2Ah"Gammafax"
--------v-2FCA00BX5442-----------------------
INT 2F - TBSCANX - INSTALLATION CHECK
    AX = CA00h
    BX = 5442h ('TB')
Return: AL = state
        00h not installed
        FFh installed
        BX = 7462h ('tb') if BX was 5442h on entry
Program: TBSCANX is a resident virus scanning module by Frans Veldman.
Note:    programs may perform virus checks on themselves, other program files,
      or their data files by invoking the TBSCANX API.
SeeAlso: AX=4653h,AX=C900h
--------v-2FCA01-----------------------------
INT 2F - TBSCANX - GET STATUS
    AX = CA01h
Return: AH = BCD version number (v2.2+)
        CAh for versions before 2.2
    AL = state (00h = disabled, 01h = enabled)
    CX = number of signatures which will be searched
---v2.0---
    BX = EMS handle, 0000h if not using EMS
---v2.3+---
    BX = segment of swap area, 0000h if not swapped
    DX = EMS or XMS handle (XMS handle if BX=0000h), FFFFh if not using EMS
SeeAlso: AX=CA02h
--------v-2FCA02-----------------------------
INT 2F - TBSCANX - SET STATE
    AX = CA02h
    BL = new state (00h = disabled, 01h = enabled)
SeeAlso: AX=CA01h
--------v-2FCA03-----------------------------
INT 2F - TBSCANX - SCAN BUFFER
    AX = CA03h
    CX = size of buffer
    DS:DX -> buffer containing data to scan
Return: CF clear if no virus signatures found
        BX,ES destroyed
    CF set if signature found
        ES:BX -> ASCIZ virus name (v2.3+)
        DS:DX -> ASCIZ virus name (v2.0)
    AX,CX,DX destroyed (v2.3+)
    all other registers except CS:IP and SS:SP destroyed (v2.0)
SeeAlso: AX=CA04h
--------v-2FCA04-----------------------------
INT 2F - TBSCANX - SCAN FILE
    AX = CA04h
    DS:DX -> filename
Return: CF clear if no virus signatures found
        BX,ES destroyed
    CF set if signature found
        ES:BX -> ASCIZ virus name
    AX,CX,DX destroyed
Note:    this function requires at least 4K free memory
SeeAlso: AX=CA03h
--------U-2FCAFEBX0000-----------------------
INT 2F U - THELP v3.0 - INSTALLATION CHECK
    AX = CAFEh
    BX = 0000h
Return: BX = segment of resident code if installed
        0000h if not installed
SeeAlso: AX=5453h,INT 2D"AMIS"
--------!---Section--------------------------