Current Session Attributes rule
Use current Session Attributes to inspect parameters stored within the current session object for the Web site visitor.
To use current Session attributes, you must know the name of the parameter to use it in a rule. All data types are supported. The current session object is the session associated with the request passed into the content spot executing the rule. For example, the current session object is the portlet session, which is unique to the portlet.
For jsps within a WAR, the current session object is the HTTP session.