wn_get_active

	status.i4.v = wn_get_active(window_id.i4.r)

	This routine returns the active window ID for graphical operations
	using "wn_xxxx" routines.

	window_id	returned active graphics window ID

	This function returns ACNET status values as follows:

	OK			success
	CBS_NOSETUP		active window has not been specified

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	wn_active(_c), wn_view(_c), wn_world(_c), wn_get_active_screen,
	intro_graphics_windows

	C/C++ usage:

	int	window_id;
	int	status;

	status = wn_get_active(&window_id);