status.i4.v = window_background_color_c(color.i4.v)

	This routine sets the background color for future TV windows.
	At program initialization this color is set to BLACK.

	color		window background color (A value of CLIB_DEFAULT_ARG
			can be passed for this argument if the caller only
			wishes to read the current background color.)
			(constants are in 'cnsparam')

	This function returns ACNET status values as follows:

	CBS_INVARG		invalid color passed
	otherwise		previous background color value

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	window_construct(_c), window_create(_c), intro_tv_windows

	C/C++ usage:

	int	status;
	int	color = BLACK;

	status = window_background_color_c(color);