## Pen for OS/2 Device Driver Reference

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### Category 93h, Function 50h - Description

    #define PEN_FUNC_SDS 0x050        /* Set display state.          */

    #define TURNBACKLIGHTON     1     /* Value to turn backlight on  */

    #define TURNBACKLIGHTOFF    0     /* Value to turn backlight off */

This function is used to turn the backlight either on or off. Turning on the backlight restarts the inactivity timer. The inactivity timer is used only if automatic control is enabled.