did_it.i4.v = window_box_c(window_id.i2.v, left_column.i4.v,
				   top_row.i4.v, right_column.i4.v,
				   bottom_row.i4.v, color.i4.v [,style.i4.v])

	This routine draws a rectangle on the color TV in the window
	specified by "window_id".  (top_row, left_column) and
	(bottom_row, right_column) specify diagonal corners relative to
	the window coordinate system.

	window_id	window ID (use WMNGR_BACKGROUND for background window)
	left_column	left hand column of box
	top_row		top row of box
	right_column	right hand column of box
	bottom_row	bottom row of box
	color		color of box (constants are in 'cnsparam')
	[style]		(LINE_THIN -> thin lined box,
			 LINE_THICK -> thick lined box)

	This function returns status values as follows:

	TRUE			window I/O actually done
	FALSE			no window I/O done

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	window_hline_c, window_vline_c, intro_tv_windows

	C/C++ usage:

	short	window_id;
	int	did_it;
	int	left_column = 1;
	int	top_row = 1;
	int	right_column = 10;
	int	bottom_row = 10;
	int	color = WHITE;
	int	style = LINE_THIN;

	did_it = window_box_c(window_id,left_column,top_row,right_column,