Int 21 Fn 4402  - Workgrp.sys - Get API Entry Point                        [N]

   AX = 4402h
   BX = file handle for device "NET$HLP$"
   CX = 0008h
   DS:DX -> buffer for entry point record

Return: CF clear if successful
       AX = number of bytes actually read
   CF set on error
       AX = error code
Program: WORKGRP.SYS is the portion of Microsoft's Workgroup Connection which
     permits communication with PCs running Windows for Workgroups or
     LAN Manager

See Also: AH=3Fh"WORKGRP.SYS"

Format of entry point record:
Offset Size    Description
 00h   WORD    3633h  \ signature???
 02h   WORD    EF6Fh  /
 04h   DWORD   address of entry point

Note:  first four bytes of buffer must be 6Fh E9h 33h 36h on entry when using
     IOCTL rather than READ to get the entry point record

Call WORKGRP entry point with:
   STACK:  WORD    function number (0000h-0009h)

Return: STACK unchanged

Call WORKGRP function 00h with:
   STACK:  WORD    0000h (function "get ???")

Return: DX:AX -> data table

Call WORKGRP function 01h with:
   STACK:  WORD    0001h (function "hook ???")

Return: STACK: DWORD   pointer to ???
       WORD    0001h (function number)

Call WORKGRP function 02h with:
   STACK:  WORD    0002h (function "unhook ???")
   ???

Return: ???

Call WORKGRP function 03h with:
   STACK:  WORD    0003h (function "reenable printer port")
       WORD    LPT port number

Return: ???

Call WORKGRP function 04h with:
   STACK:  WORD    0004h (function "disable printer port")
       WORD    LPT port number

Return: ???

Call WORKGRP function 05h with:
   STACK:  WORD    0005h (function "???")
       ???

Return: ???

Call WORKGRP function 06h with:
   STACK:  WORD    0006h (function "???")

Return: STACK unchanged
   AX = 0000h
   DX = 0000h

Call WORKGRP functions 07h-09h with:
   STACK:  WORD    0007h-0009h (NOP functions)

Return: STACK unchanged
   AX = 0001h
   DX = 0000h