Int 68 Fn 02  - Appc/pc - Connection Control - Prepare To Receive          [N]

   AH = 02h subfn 0A00h
   DS:DX -> control block

Return: control block updated

See Also: AH=02h/SF=0900h,AH=02h/SF=0B00h

Format of control block:
Offset Size    Description
 00h 12 BYTEs  reserved
 0Ch   WORD    0A00h (verb "Prepare_to_Receive" or "MC_Prepare_to_Receive")
 0Eh   BYTE    1 if MC_ (mapped conversation) form of verb
       0 if basic verb
 0Fh  5 BYTEs  reserved (0)
 14h   WORD    (big-endian) primary return code (see AH=02h/SF=0100h)
 16h   DWORD   (big-endian) error code (see AH=02h/SF=0100h)
 1Ah  8 BYTEs  (big-endian) TP_ID
 22h   DWORD   (big-endian) conversation ID
 26h   BYTE    type (0=SYNC_LEVEL, 1=FLUSH)
 27h   BYTE    locks (0=short, 1=long)