This function returns a handle to a presentation space that can be used for drawing while a direct manipulation operation is in progress.
DrgGetPS is called only during a direct manipulation operation. This function is called only after a DM_DRAGOVER, DM_DRAGLEAVE, or DM_DROP message has been received.
In order to draw target emphasis, an application must use DrgGetPS and DrgReleasePS to unlock its window.
The presentation space created with DrgGetPS must be freed with DrgReleasePS.