A excerpt with essential parts to show a usage of af:activeOutputText in conjunction with af:ajax tag

chatExcerpt.xml

<!-- Data push -->     <!-- anonymous javascript function onevent does nothing -->
 <f:ajax event="propertyChange" onevent="function(e) {}" render="t1 t2 ot1">
       <af:activeOutputText value="#{chatListenerBean.message}" id="aot1">
           <f:ajax/> <!-- this tag does nothing -->
       </af:activeOutputText>
 </f:ajax>
<!-- Output text Alive:true -->
<af:outputText id="ot1" 
               value=" Alive:#{chatListenerBean.pong}" 
               clientComponent="true"/>

<!-- .. layout tags stripped .. -->

<!-- Table with chat messages - displayed in a center  - 
    some formatting attributes stripped -->
<af:table id="t1" value="#{chatBean.messages}" clientComponent="true"
          var="row" contentDelivery="immediate" displayRow="last" >
<!-- Table Users displayed on a right panel -->
<af:table id="t2" value="#{chatBean.users}" clientComponent="true"
               contentDelivery="immediate" var="row">