title: Using UIBackgroundModes to run code in background mode
body: <p>Has anyone tried using <code>UIBackgroundModes</code> to register for any networking stuff? I want to keep running my server fetching code and playing some sound based on the server response even when my application is in the background or the device is sleeping.</p>
  
  <p>Any clue on this and what would be the impact of using this?</p>