INT 68 - APPC/PC - CONNECTION CONTROL - SEND DATA
        AH = 02h subfn 0F00h
        DS:DX -> control block
Return: control block updated
SeeAlso: AH=02h/SF=0E00h,AH=02h/SF=1000h

Format of control block:
Offset  Size    Description
 00h 12 BYTEs   reserved
 0Ch    WORD    0F00h (verb "Send_Data" or "MC_Send_Data")
 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    request to send received (0=no, 1=yes)
 27h    BYTE    00h
 28h    WORD    data length
 2Ah    DWORD   pointer to data

.