## Display Device Driver Reference for OS/2

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### Windows INT 2Fh Support

Windows DD - Notify Background Switch

        AX    = 4001H
        CX    = Seamless identifier "SM"
        DX    = Seamless sub-function

              0100H....disable hardware Write access
              0101H....disable hardware Read/Write access

Windows DD - Notify Foreground Switch

        AX    = 4002H
        CX    = Seamless identifier "SM"
        DX    = Seamless sub-function

              0200H....enable hardware Write access
              0201H....enable hardware Read/Write access
              0202H....enable hardware Read/Write access and
                       force repaint