two sub UIwindow in one UIWindow?

when we create ipho开发者_如何学Gone project, one UIWindow is created automatically.In that UIwindow UIViewcontroller's view is added on that window.but i want to create one parent UIWindow on which i have to add two sub window .In that sub windows i have add UIview controllers as normal...is it possible? any help please?

You should be able to add any number of UIViews to your UIWindow, but not UIWindows.