## Graphics Adapter Device Driver Reference

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### HWEXTENSION

Input data to the GHI_CMD_EXTENSION function.

    typedef struct _HWEXTENSION {

      ULONG      ulLength;         /*  Size of the HWEXTENSION data structure, in bytes. */

      ULONG      ulXSubFunction;   /*  Subfunction code. */

      ULONG      cScrChangeRects;  /*  Count of screen rectangles affected by HWEXTENSION. */

      PRECTL     arectlScreen;     /*  Array of screen rectangles affected by HWEXTENSION. */

      ULONG      ulXFlags;         /*  Flag indicating hardware serialization. */

      PVOID      pXP1;             /*  Extension-specific input packet. */

    } HWEXTENSION;

    typedef   HWEXTENSION   * PHWEXTENSION ;