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        Dos 4+ ansi.sys internal - Misc requests

        Entry:
          AX = 1A02h
          DS:DX -> parameter block
                BYTE  subfunction
                    00h set/reset interlock
                        DS:[DX+1] BYTE 00h=reset, 01h=set
                        This interlock prevents some of the ANSI.SYS post-
                        processing in its hook onto INT 10, AH=00h mode set
                    01h get /L flag
                        Result: DS:[DX+2] BYTE = 00h if /L not in effect
                                               = 01h if /L in effect