title: iOS multitasking : let a stream play when the app is in the tray
body: <p>Does anyone knows how I can let an audio stream play (from a webview ou in a AVPlayer component) after the app lose focus (when the home button is pushed) ? In iOS 4.2. I know I must read about multitasking but if you could just point out a few things for that particular case, that would be great. Exactly the same behavior as if you click a stream link and it's open in Safari. You have to shutdown the application in the multitask tray to end it.</p>
  
  <p>Like if you want to listen to a radio station while working in another app.</p>
  
  <p>Thanks !</p>