Out of desperation I'm listing the output of my attempts here,
all marked with ##########MASKED######### are application specific and insignificant
ExternalContext.getUserPrinicipal() : null
ExternalContext.getRemoteUser: null;
ExternalContext.Maps
O ###########Dumping Map: RequestHeaderMap
O Key <accept-language> Value <en-us,en;q=0.5>
O Key <wps.markup> Value <html>
O Key <content-type> Value <application/x-www-form-urlencoded>
O Key <accept-encoding> Value <gzip,deflate>
O Key <user-agent> Value <Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.4) Gecko/20091016 Firefox/3.5.4 (.NET CLR 3.5.30729)>
O Key <cookie> Value <GUEST_LANGUAGE_ID=en_US; COOKIE_SUPPORT=true; LOGIN=6272756e6f4037636f67732e636f6d; SCREEN_NAME=6d6a4b4a6a616e795670303d; JSESSIONID=0000j5WQt_ktcoGWq-5uqVLAQ20:-1>
O Key <content-length> Value <359>
O Key <accept-charset> Value <ISO-8859-1,utf-8;q=0.7,*;q=0.7>
O Key <connection> Value <keep-alive>
O Key <host> Value <localhost:9081>
O Key <accept> Value <text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8>
O Key <referer> Value <http://localhost:9081/wps/myportal/!ut/p/_s.7_0_A/7_0_1A95?cID=6_0_3S&nID=7_0_5L>
O Key <keep-alive> Value <300>
O ########################################
O ###########Dumping Map: RequestMap
O Key <DEFAULT> Value <com.sun.faces.lifecycle.LifecycleImpl@6af56af5>
O Key <com.ibm.faces.FACES_CONTEXT> Value <com.ibm.faces.context.PortletFacesContextImpl@15841584>
O Key <varuserList> Value <##########MASKED#########@623d623d>
O Key <com.ibm.faces.CONTEXT_FACTORY> Value <com.ibm.faces.context.PortletFacesContextFactoryImpl@5d635d63>
O Key <pc_##########MASKED#########> Value <pagecode.##########MASKED#########@67586758>
O Key <com.ibm.faces.LIFECYCLE_FACTORY> Value <com.sun.faces.lifecycle.LifecycleFactoryImpl@8580858>
O Key <javax.portlet.userinfo> Value <null>
O Key <com.ibm.faces.webapp.PortletConstants_LIFECYCLE_RUN> Value <com.ibm.faces.webapp.PortletConstants_LIFECYCLE_RUN>
O ########################################
O ###########Dumping Map: SessionMap
O Key <javax.portlet.p.7_0_1A9A?javax.faces.request.charset> Value <null>
O Key <javax.portlet.p.7_0_1A9A?com.sun.faces.VIEW_LIST> Value <null>
O Key <javax.portlet.p.7_0_1A9B?com.ibm.faces.portlet.page.view> Value <null>
O Key <javax.portlet.p.7_0_1A9A?sessionBean> Value <null>
O Key <javax.portlet.p.7_0_1A9A?com.ibm.faces.portlet.page.view> Value <null>
O Key <javax.portlet.p.7_0_1A9B?com.ibm.faces.portlet.CURRENT_PORTLET_ID> Value <null>
O Key <javax.portlet.p.7_0_1A9A?com.ibm.faces.portlet.CURRENT_PORTLET_ID> Value <null>
O Key <javax.portlet.p.7_0_1A9A?/##########MASKED#########.jsp> Value <null>
O Key <javax.portlet.p.7_0_1A9B?/##########MASKED#########jsp> Value <null>
O Key <javax.portlet.p.7_0_1A9B?com.sun.faces.VIEW_LIST> Value <null>
O Key <javax.portlet.p.7_0_1A9B?javax.faces.request.charset> Value <null>
O Key <javax.portlet.p.7_0_1A9B?##########MASKED#########SessionBean> Value <null>
O ########################################
O ###########Dumping Map: RequestCookieMap
O ########################################
O ###########Dumping Map: InitParameterMap
O Key <com.ibm.ws.jsf.LOAD_FACES_CONFIG_AT_STARTUP> Value <true>
O Key <com.ibm.ws.jsf.JSP_UPDATE_CHECK> Value <true>
O ########################################
