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;