I have also heard that tip plenty of times, but it's difficult to give links and references to real life conversations :). Anyway, the UIApplicationExitsOnSusp

I have also heard that tip plenty of times, but it's difficult to give links and references to real life conversations :). Anyway, the UIApplicationExitsOnSuspend key is for legacy apps, and has nothing to do with the article. If that key is set to YES, iOS treats your app as it did before 4.0 and restarts the app every time you switch away from it and back again. The article explains how it works on iOS 4.0 and later.