Int 61 Fn 23  - Pc/tcp Kernel V2.05+ - "net_listen" - Listen For Incoming  [N]

   AH = 23h
   BX = network descriptor or FFFFh to allocate descriptor
   DX = type of service
   DS:SI -> "addr" structure (see #3133)

Return: CF clear if successful
       AX = network descriptor
   CF set on error
       AX = error code (see #2990 at INT 61"FTP Software")

Notes: type of service and "addr" structure are as for AH=13h
   any of the address structure can be zero; normally local socket number
     is filled in prior to call

See Also: INT 61"FTP Software",INT 61/AH=00h"PC/TCP",INT 61/AH=13h

See Also: INT 63/AH=12h"BW-TCP"