is_valid_window_id_c

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

	This routine determines if a given value is a valid console window ID.

	window_id	window ID
			(constants are in 'cnsparam')

	This function returns status values as follows:

	TRUE			value is a valid console window ID
	FALSE			value is a not valid console window ID

	This function requires the following include files:

	cnsparam_h, cbslib_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,
	console_window_iconify_c

	C/C++ usage:

	int	status;
	int	window_id = LX2_MAIN_TV_A;

	status = is_valid_window_id_c(window_id);