1. A non-transitory computer readable storage medium comprising computer usable program code executed to perform operations for collaboration between a plurality of associated portlets in a portal server, the operations comprising: defining a common Portlet Application Session Object, the Portlet Application Session Object comprising a data store session object and configured to allow each portlet in a portlet application to share session information; associating each portlet in a portlet application with a portlet descriptor describing a dynamic context name, each portlet configured to access the common Portlet Application Session Object, the dynamic context name referencing a dynamic context configured to be changed during runtime; and forming collaboration groups of portlets having corresponding dynamic context names, a collaboration group being a subgroup of the group of portlets in the portlet application, the portlets in each collaboration group sharing dynamic context changes through the Portlet Application Session Object.
1. A non-transitory computer readable storage medium comprising computer usable program code executed to perform operations for collaboration between a plurality of associated portlets in a portal server, the operations comprising: defining a common Portlet Application Session Object, the Portlet Application Session Object comprising a data store session object and configured to allow each portlet in a portlet application to share session information; associating each portlet in a portlet application with a portlet descriptor describing a dynamic context name, each portlet configured to access the common Portlet Application Session Object, the dynamic context name referencing a dynamic context configured to be changed during runtime; and forming collaboration groups of portlets having corresponding dynamic context names, a collaboration group being a subgroup of the group of portlets in the portlet application, the portlets in each collaboration group sharing dynamic context changes through the Portlet Application Session Object. 2. The computer readable storage medium of claim 1 wherein each portlet in a portlet application comprises an independent portlet session, all independent portlet sessions for a portlet application sharing a Portlet Application Session Object.