status.i4.v = wn_world(window_id.i4.r, min_x.r4.r, min_y.r4.r,
			       max_x.r4.r, max_y.r4.r)

	status.i4.v = wn_world_c(window_id.i4.v, min_x.r4.v, min_y.r4.v,
				 max_x.r4.v, max_y.r4.v)

	This routine sets the virtual (or world) limits for a graphics window
	and from these calculates the scaling transform constants.  The limits
	("min_x", "min_y", "max_x", and "max_y") should be in real world
	coordinates such as seconds, amps, etc.

	window_id	window ID (use WN_BACKGROUND for background window)
	min_x, min_y	lower left hand corner of window
	max_x, max_y	upper right hand corner of window

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid ID or coordinates specified
	CBS_INVID		this window does not exist
	CBS_RANGE		invalid coordinates for the scaling chosen
	CBS_MATH_EXCEPTION	math exception occurred while calculating
				window scaling parameters

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_view(_c), wn_active(_c), wn_set_scaling(_c), intro_graphics_windows

	C/C++ usage:

	int	status;
	int	window_id;
	float	min_x = 1.0;
	float	min_y = 1.0;
	float	max_x = 10.0;
	float	max_y = 10.0;

	status = wn_world_c(window_id,min_x,min_y,max_x,max_y);