status.i4.v = wn_get_view_coords_c(window_id.i4.v, xmin.r4.r, ymin.r4.r,
					   xmax.r4.r, ymax.r4.r)

	This routine returns the viewport coordinates for a graphics window.

	window_id	window ID (use WN_BACKGROUND for background window)
	xmin, ymin	returned lower left hand corner of window
	xmax, ymax	returned upper right hand corner of window

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid ID value
	CBS_INVID		this window doesn't exist

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_view(_c), wn_get_world_coords_c, intro_graphics_windows

	C/C++ usage:

	int	status;
	int	window_id;
	float	xmin;
	float	ymin;
	float	xmax;
	float	ymax;

	status = wn_get_view_coords_c(window_id,&xmin,&ymin,&xmax,&ymax);