title: Sending a message to all actors within an ActorSystem
body: <p>Is it possible to send a message to <em>all</em> actors in an actor system? I've been looking at the <a href="http://doc.akka.io/docs/akka/snapshot/scala/routing.html#broadcast-messages-scala" rel="noreferrer">Broadcast router</a> example, but that is so marginal I can't comprehend how I add actors to the router dynamically.</p>
  
  <p>We are using scala for akka.</p>
  
  <p>Thanks!</p>