title: Download data in background with iOS4
body: <p>As per the latest update of <a href="http://itunes.apple.com/us/app/kindle/id302584613?mt=8" rel="nofollow">Kindle</a> V2.5, it has support of "continue downloading books while the app is in the background on iOS 4 devices".</p>
  
  <p>How is it possible to download content in background? As per the <a href="http://developer.apple.com/library/ios/#documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/BackgroundExecution/BackgroundExecution.html" rel="nofollow">iOS multitasking documentation</a>, only audio, voip &amp; location updates are possible in background. And I've also maken sure that NSURLConnection doesn't download new data work while app goes background. Then how's it possible with Kindle app?</p>
  
  <p><strong>Edit:</strong> I haven't checked Kindle App in iOS4 multitasking enabled device. So if anyone let me (&amp; community) know what exactly Kindle app does to download, that would be very much helpful.</p>