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INT 10 - VIDEO (DESQview 2.0x only) - internal - GET CURRENT WINDOW INFO
        AH = 82h
        DX = 4456h ('DV')
Return: DS = segment in DESQview for data structure
             in DV 2.00,
                  BYTE DS:[0] = window number
                  WORD DS:[1] = segment of other data structure
                  WORD DS:[3] = segment of window's object handle
        ES = segment of DESQview data structure for video buffer
        AL = current window number
        AH = ???
        BL = direct screen writes
            00h program does not do direct writes
            01h program does direct writes, so shadow buffer not usable
        BH = ???
        CL = current video mode
        CH = ???
Note:   this function is probably meant for internal use only, due to the magic
          value required in DX