void ClearCurBackground(screen, top,left, height,width) register TScreen *screen; int top; int left; unsigned height; unsigned width;
void ClearCurBackground( register TScreen *screen, int top, int left, unsigned height, unsigned width)
void ClearCurBackground(screen, top,left, height,width)	register TScreen *screen;	int top;	int left;	unsigned height;	unsigned width;{	useCurBackground(TRUE);	XClearArea (screen->display, TextWindow(screen),		left, top, width, height, FALSE);	useCurBackground(FALSE);}