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4/8/2010
DirectDrawSurface objects expose their functionality through the IDirectDrawSurfaceinterfaces.
Each new interface version provides the same utility as its predecessors, with additional options available through new methods.
When you create a surface by calling the IDirectDraw::CreateSurfacemethod (or another creation method from IDirectDraw), you receive a pointer to the surface's IDirectDrawSurfaceinterface.
If you want to work with a different iteration (in particular IDirectDrawSurface) of the interface, you must query for it.