status.i4.v = is_tv_window_id_c(window_id.i4.v)

	This routine determines if a given console window ID refers to
	a TV window.

	window_id	window ID
			(constants are in 'cnsparam')

	This function returns status values as follows:

	TRUE			window ID refers to a TV window
	FALSE			window ID is not a TV window

	This function requires the following include files:

	cnsparam_h, clib_friend_h, acnet_errors_h

	Related functions:

	console_window_set_size_c, console_window_position_c,
	console_window_center_c, console_window_home_c,
	console_window_raise_c, console_window_lower_c,

	C/C++ usage:

	int	status;
	int	window_id = LX2_MAIN_TV_A;

	status = is_tv_window_id_c(window_id);