ors place event listeners on their view components, which they
  then handle in the usual way. This may lead to the broadcast of <code>Notification</code>s to
  trigger <code>ICommand</code>s or to communicate with other <code>IMediators</code>. <code>IProxy</code> and <code>ICommand</code>
  instances communicate with each other and <code>IMediator</code>s  by broadcasting <code>INotification</code>s.</p></p>
<p><p>A key difference between Flash <code>Event</code>s and PureMVC
  <code>Notification</code>s 