Int 21 Fn 4402  U - Pendos Pendev.sys - Get Entry Points                   [n]

   AX = 4402h
   BX = file handle for device "$$PENDOS" or "$$PD_REG"
   CX = size of buffer (4 for $$PENDOS and a 4,8,12, or 16 for $$PD_REG)
   DS:DX -> buffer for entry point record (see below)

Return: CF clear if successful
       buffer filled
   CF set on error
       AX = error code (01h,05h,06h,0Dh) (see AH=59h)
Program: A limited version of PenDOS by Communication Intelligence Corporation,
     which provides pen capability to keyboard-based programs, is bundled
     with IBM DOS 6.1

See Also: AX=4403h"PENDEV.SYS"

Format of entry point record:
Offset Size    Description
 00h   DWORD   -> array of jumps
 04h   WORD    offset of function to retrieve entry point
 06h  2 BYTEs  signature "Pe"
 08h   WORD    offset of function to set entry point
 0Ah  2 BYTEs  signature "nD"
 0Ch   WORD    offset of function to clear entry point
 0Eh   WORD    signature "OS"

Call function to retrieve entry point with:
   AX = index of entry point (0-9)

Return: CF clear if successful
       DX:AX -> desired entry point
   CF set on error (AX out of range)

Call function to set entry point with:
   AX = index of entry point (0-9)
   DX:SI -> new handler

Return: CF clear if successful
   CF set on error (AX out of range)

Call function to clear entry point with:
   AX = index of entry point (0-9)

Return: CF clear if successful
   CF set on error (AX out of range)

Note:  resets the jump at the specified entry point to its default target,
     which simply returns