Faces inter-portlet communication within the IBM® portlet framework is typically handled either through cooperative portlets, or through a traditional direct portlet messaging architecture. Cooperative portlet communication, using Click-to-Action (which is based on WebSphere® Portal property broker), is a brokered communication methodology,
The Click-to-Action mechanism is the recommended method for Faces inter-portlet communication. The Cooperative portlet support supplied by the Rational® Software Development Platform automatically generates the necessary taglib directives and Faces tags for Faces JSP files used as Click-to-Action sources and targets.
See the help topics related to cooperative portlets and Click-to-Action for usage and implementation details.