title: iOS push notification - send a message to everyone
body: <p>I'm writing my first iOS app with push notification and so far so good. I'm able to send notifications from a web server as long as I enter the device token of the receiver. </p>
  
  <p>So I was wondering: Is there a simple way to send a notification to everyone who has the app installed? Or do I have to make the manually register with the push server when it launches?</p>
  
  <p>Is there any guidelines on how this is done?</p>