ClipCursor(lpRect)  \
 { \
 if (lpRect) MOUSE_SetHBounds(lpRect->left, lpRect->right),
                MOUSE_SetVBounds(lpRect->top, lpRect->bottom); \
 else        MOUSE_SetHBounds(0, VideoInfo.width-1),
                MOUSE_SetVBounds(0, VideoInfo.length-1); \
 }