Structure describing attributes of VRAM.

typedef struct _APERTURE {
  ULONG     ulPhysAddr;      /*  Physical address of VRAM. */
  ULONG     ulApertureSize;  /*  Size of VRAM. */
  ULONG     ulScanLineSize;  /*  Size of a scan line. */
  RECTL     rctlScreen;      /*  Rectangle of screen coordinates. */
} APERTURE;

typedef   APERTURE   * PAPERTURE ;