VMRGUID structure is a member of the VMRMONITORINFO structure and is used to identify a monitor on the system (VMR-7 only).
Pointer to the GUID member of the structure. pGUID is NULL if the monitor is the default DirectDraw device.
Specifies the GUID for the monitor.
In DirectX 9.0 and later, the monitor is identified by an integer index, not by a GUID.