mirrorring ipod screen on external monitor

Question

I would like to display the ipod screen on an external display. For this I create two instance of UIWindow and add the my view controllers view as subview of these windows. But it is displaying only on external window.

[window addSubview:tabBarController.view]; [window makeKeyAndVisible]; [externalWindow addSubview:tabBarController.view]; [externalWindow makeKeyAndVisible];

Is it not possible to add the same view on both windows? How can make it work?