/* Gets the rect describing the client area (drawable area) of the
* specified window. Output is position of corners of client area (drawable area) on the screen.
* Does not touch clientRect if window pointer or window handle is NULL.
/* Gets the rect describing the client area (drawable area) of the
* specified window. Output is position of corners of client area (drawable area) on the screen.
* Does not touch clientRect if window pointer or window handle is NULL.