INT 2F - AD-DOS - GET AND RESET VxD API STATUS
        AX = C020h
Return: AL = 00h if successful
            BX = VxD API Status
                0000h no error
                0001h error
                0100h neither Windows 3.X enhanced mode nor
                        Windows/386 2.x is running
                0200h VM API entry point not found (VxD not installed)
Notes:  AH=C0h is the default multiplex number; if this is already in use,
          After Dark will try successive values up to AH=FFh
        this call resets the VxD API Status to zero
SeeAlso: AX=1602h,AX=1607h
Index:  screen saver;AD-DOS

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