An application uses the WinCreateCursor function to specify information about the cursor rectangle and the clipping rectangle. WinCreateCursor specifies whether the cursor rectangle should be filled, framed, blinking, or halftone. In addition, the function specifies the clipping rectangle, in window coordinates, that controls the cursor clipping region. Probably the most efficient strategy is for the application to specify NULL, which causes the rectangle to clip the cursor to the window rectangle.