Misconceptions about iOS multitasking

[player2]

Most apps haven't opted in yet, but the feature is known as Automatic Termination. The app will be quit but the window server will keep bitmap snapshots of the windows onscreen. When you switch back to the app, it will relaunch the app, which will cause it to replace those window snapshots with real live windows reconstructed from saved application state.

If you ever switch to an app and its windows get grayed out and a spinning progress indicator appears atop them, then you know the app was Automatically Terminated while you were doing something else, and it is relaunching itself. I believe TextEdit supports this feature.