One of the objectives in 959 exam is "Identify supported portlet frameworks". I searched in the 6.1 Information Center (http://publib.boulder.ibm.com/infocenter/wpdoc/v6r1m0/index.jsp) and I can only find Struts Portlet Framework. Is that it for Portlet Frameworks in 6.1? Or do we consider JSR168 and JSR286 as Portlet Frameworks as well? Or are there more Portlet Frameworks?