status.i4.v = window_callback_term(callback_id.i2.r)

	This function will remove a window_intype callback registration
	which was previously made with window_callback_init

	callback_id	window_intype registration ID which was returned
			by the window_callback_init routine

	This function returns status values as follows:

	OK			success
	CBS_NO_SUCH		requested ID does not exist

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	window_callback_init, window_intype, window_register_function_c,
	window_unregister_function_c, window_add_callback_c,
	window_remove_callback_c, intro_tv_windows

	C/C++ usage:

	short	callback_id;
	int	status;

	status = window_callback_term(&callback_id);