de> 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>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>abstract boolean</code></td>
<td class="colLast"><span class="typeNameLabel">FacesEvent.</span><code><span class="memberNameLink"><a href="../../../../javax/faces/event/FacesEvent.html#isAppropriateListener-javax.faces.event.Face