DiveQueryCaps Parameter - ulPlaneBufNum

ulPlaneBufNum (ULONG) - input

Indicates the plane for which information is to be returned.

DIVE_BUFFER_SCREEN

Return information for graphics plane. This is the default.
DIVE_BUFFER_GRAPHICS_PLANE
Return information for graphics plane.
DIVE_BUFFER_ALTERNATE_PLANE
Return information for overlay plane, if present.

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