INT 1A - SNAP.EXE 3.2+ - "SNAP_SETCONVPARMS" - SET CONVERSATION PARAMETERS
        AX = 7202h
        STACK:  WORD    conversation ID (0000h-0009h)
                WORD    offset within resident data segment of "Cparms"
                        structure (see AX=6308h)
Return: AX = status???
        STACK unchanged