Int 61 Fn 13  - PC/tcp Kernel V2.05 - "net_connect" - Open A Network Conn  [N]

   AH = 13h
   BX = network descriptor (FFFFh for automatic net_getdesc)
   DX = protocol (see below)
   DS:SI -> buffer for "addr" structure (see below)

Return: CF clear if successful
       AX = network descriptor used or allocated
   CF set on error
       AX = error code (see INT 61"PC/TCP")

Notes: invokes AH=22h if BX=FFFFh on entry; also invokes AH=19h in various
     cases
   will wait for protocol on stream connections unless non-blocking was
     set with AH=20h

See Also: INT 61"PC/TCP",INT 61/AH=00h"PC/TCP",INT 61/AH=18h,INT 61/AH=23h

See Also: INT 63/AH=14h"BW-TCP"

Values for protocol:
 0001h raw net (undocumented)
 0002h raw IP
 0003h datagram (UDP)
 0004h stream (TCP)
 0005h raw ICMP

Format of structure "addr":
Offset Size    Description
 00h   DWORD   Internet address (network order)
 04h   WORD    remote socket number (network order)
 06h   WORD    local socket number (network order) 0000h means "you choose"
 08h   BYTE    protocol (see above)