Advantages, problems, examples of adding another UIWindow to an iOS app?

Question

Recently I\'ve been wondering about the fact that that an iOS app only has one UIWindow. It does not seem to be an issue to create another UIWindow

Answer 1

A UIWindow can float above other UI elements like the system keyboard.

To address your last paragraph: Make a UIWindow with the same frame as your main window. Set its windowLevel property to UIWindowLevelStatusBar. Set its hidden property to NO.