prclClip (PRECTL) - input
A rectangle within which the cursor is visible. If the cursor goes outside this rectangle, it is clipped away and is invisible.
The rectangle is specified in window coordinates.
If prclClip is NULL, the drawing of the cursor is clipped to the window rectangle of hwnd.
Note: The cursor is always clipped to the window rectangle, even if part of prclClip is outside it.
The value of each field in this structure must be in the range -32 768 through 32 767. The data type WRECT can also be used, if supported by the language.