intersect.i4.v = wn_intersect_c(window_id_1.i4.v, window_id_2.i4.v
					[,x1.i4.r] [,y1.i4.r]
					[,x2.i4.r] [,y2.i4.r])

	This routine returns a value of TRUE if the windows indicated
	intersect.  It will also optionally return the intersecting
	rectangle in full screen coordinates.

	window_id_1	ID of first window
	window_id_2	ID of second window
	[x1, y1]	returned upper left corner of the intersection
	[x2, y2]	returned lower right corner of the intersection

	This function returns status values as follows:

	TRUE			the two windows intersect
	FALSE			the two windows are tiled

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	wn_occluded_c, intro_graphics_windows

	C/C++ usage:

	int	intersect;
	int	window_id_1;
	int	window_id_2;
	int	x1;
	int	y1;
	int	x2;
	int	y2;

	intersect = wn_intersect_c(window_id_1,window_id_2,&x1,&y1,&x2,&y2);