If your looking for a way to dispatch events in objective-c just as you did with ActionScript (EventHandlers), take a look at the following article: http://www.hivestudio.cat/index.php?option=com_content&view=article&id=54:technical-note-communicate-using-nsnotificationcenter&catid=35:technical-note-category&Itemid=76 The magical word for these functions is called NSNotificationCenter and allows you to easily synchronize threads that run in the background.$ happy coding, Jan