HRESULT Clone(LPUNKNOWN pUnkOuter, REFIID riid, LPVOID *ppvObj);
Creates a copy of an object.
·Returns D3DRM_OK if successful, or an error otherwise. For a list of possible return codes, see Direct3D Retained-Mode Return Values.
pUnkOuter
Allows COM aggregation features.
riid
Identifier of the object being copied.
ppvObj
Address that will contain the copy of the object when the method returns.