title: actor replying to non-actor
body: <p>I'm just beginning with AKKA and have a basic question about how non-actor code talks to actor code. </p>
  
  <p>How can non-actor code call an actor and get a response ? I've tried calling the actor from the non-actor using <code>Patterns.ask</code> but this doesn't work because there is no 'sender' to which the actor can respond.</p>
  
  <p>So how am I supposed to do it ?</p>