|Microsoft DirectX 9.0|
The SetZOrder method sets the z-order of a particular video stream.
This method is not currently implemented and returns E_NOTIMPL.
HRESULT SetZOrder( DWORD dwZOrder );
[in] Value indicating the order in which streams will clip each other.
The z-order indicates which streams can clip other streams. Images with larger z-values are always in front of images with smaller z-values.
The relative order of multiple streams is significant only if the video images overlap.
Specifying the same z-order for two overlapping streams can cause strange video artifacts.