status.i4.v = wn_box_pixel_c(x1.i4.v, y1.i4.v, x2.i4.v, y2.i4.v

	This routine draws a rectangle at the specified pixel
	coordinates.  The coordinates can either be absolute
	screen coordinates or relative to a graphical window
	specified by a previous call to wn_active(_c).  The
	color of the rectangle is determined by the most recent
	call to wn_color(_c).  The width of an unfilled rectangle
	is determined by the most recent call to wn_border_width_c.
	Whether the rectangle is filled or not is determined by the
	most recent call to wn_fill_mode(_c).

	x1, y1		pixel coordinates of one corner of box
	x2, y2		pixel coordinates of diagonal corner of box
	[relative_pos]	flag indicating whether the coordinates should
			be interpreted as full screen coordinates or
			if they are relative to the active window
			(TRUE -> coordinates are relative to the active window,
			 FALSE -> coordinates are absolute screen coordinates

	This function returns ACNET status values as follows:

	OK			success
	CBS_NOSETUP		an active window has not been established

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_box(_c), wn_color(_c), wn_user_defined_color_c,
	wn_read_user_defined_color, wn_fill_mode(_c), wn_border_width_c,
	wn_flush, intro_graphics_windows

	C/C++ usage:

	int	status;
	int	x1 = 3;
	int	y1 = 3;
	int	x2 = 8;
	int	y2 = 8;
	int	relative_pos = FALSE;

	status = wn_box_pixel_c(x1,y1,x2,y2,relative_pos);