This function retrieves the screen coordinates of the rectangular area to which the cursor is confined.
Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.
The cursor is a shared resource. If an application confines the cursor with the ClipCursor function, it must later release the cursor by using ClipCursor before relinquishing control to another application.
The calling process must have WINSTA_READATTRIBUTES access to the window station.