title: GCKDeviceManager Class : joinApplication:sessionID
body: <p>I'm trying to understand the purpose of this function.
  With this function I can connect two applications? I mean two different senders/iOS app to one receiver?</p>
  
  <p>An example would be great, thanks.</p>
  
  <p>I am using this example: <a href="https://github.com/googlecast/CastVideos-ios" rel="nofollow">https://github.com/googlecast/CastVideos-ios</a></p>