lxbox(top_row.i4.r, left_column.i4.r, bottom_row.i4.r,
	      right_column.i4.r, color.i4.r [,fill_it.i4.r])

	lxbox_c(top_row.i4.v, left_column.i4.v, bottom_row.i4.v,
		right_column.i4.v, color.i4.v [,fill_it.i4.v])

	This routine draws a box on the current graphics screen with
	corners at "top_row", "left_column" and "bottom_row", "right_column".

	top_row		row of first corner
	left_column	column of first corner
	bottom_row	row of second corner
	right_column	column of second corner
	color		color of box (constants are in cnsparam)
	[fill_it]	fill flag
			(TRUE -> filled box,
			 FALSE -> empty box (default))

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	lxhlin(_c), lxvlin(_c), wn_box(_c), lx_row_to_pix(_c),
	lx_col_to_pix(_c), read_lx_format