>Enable the method invocation
 specified by this component instance to return a value that
 performs navigation, similar in spirit to <a href="../../../javax/faces/component/UICommand.html#broadcast-javax.faces.event.FacesEvent-"><code>UICommand.broadcast(javax.faces.event.FacesEvent)</code></a>.</p>

 <div class="changed_added_2_2">

 <p>Take no action and return immediately if any of the following
 conditions are true.</p>

 <ul>

 <li><p>The response has already been marked as complete.</p></li>

 <li><p