Input packet to the GHI_CMD_VRAM function via the VRAMIN data structure.
typedef struct _VRAMREGISTERIN {
ULONG ulLength; /* Size of the VRAMREGISTERIN data structure, in bytes. */
ULONG ulHandle; /* Handle required as input on deregister. */
ULONG ulFlags; /* Flag indicating type of VRAM registration. */
} VRAMREGISTERIN;
typedef VRAMREGISTERIN *PVRAMREGISTERIN;