if (! DApplication.SessionBus.NameHasOwner (bus_name))
	DApplication.SessionBus.StartServiceByName (bus_name, 0);

nf = DApplication.SessionConnection.GetObject<INotification>
	(bus_name, new ObjectPath (object_path));
if (nf == null)
	throw new ApplicationException ("Couldn't get org.freedesktop.Notifications DBus interface!");