Listener-">isAppropriateListener</a></span>(<a href="../../../../javax/faces/event/FacesListener.html" title="interface in javax.faces.event">FacesListener</a>&nbsp;listener)</code>
<div class="block"><p class="changed_added_2_0">Returns <code>true</code> if and
 only if the argument <code>listener</code> is an instance of
 <a href="../../../../javax/faces/event/SystemEventListener.html" title="interface in javax.faces.event"><code>SystemEventListener</code></a>.</div>
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