26.2.2. Ajaxified renderers

At runtime the portal combines the layout and the renderers in order create the markup returned to the web browser. The most used render set is the divRenderer. Renderers only need a modification in the deployment descriptor to indicate that they support ajax. Here is the declaration of the default divRenderer now in 2.6:
<renderSet name="divRenderer">
   <set content-type="text/html">
      <ajax-enabled>true</ajax-enabled>
      <region-renderer>org.jboss.portal.theme.impl.render.div.DivRegionRenderer
      </region-renderer>
      <window-renderer>org.jboss.portal.theme.impl.render.div.DivWindowRenderer
      </window-renderer>
      <portlet-renderer>org.jboss.portal.theme.impl.render.div.DivPortletRenderer
      </portlet-renderer>
      <decoration-renderer>org.jboss.portal.theme.impl.render.div.DivDecorationRenderer
      </decoration-renderer>
   </set>
</renderSet>
You should notice the <ajax-enabled>true</ajax-enabled> which indicates that the render set supports ajaxification.