INT 1A - SNAP.EXE 3.2+ - "SNAP_ENDCONV" - END CONVERSATION
        AX = 6405h
        STACK:  WORD    conversation ID (0000h-0009h)
                DWORD   pointer to message buffer
                WORD    length of message
                WORD    0000h (use default "Cparms" structure)
Return: AX = status (see AX=6108h)
        STACK unchanged
Program: SNAP.EXE is a TSR written by IBM and Carnegie Mellon University
          which implements the Simple Network Application Protocol