You should read the spec... Section 15

anonymous wrote : PLT.15.3 Binding Attributes into a Session
  | A portlet can bind an object attribute into a PortletSession by name.
  | The     PortletSession interface defines           two    scopes    for   
storing   objects,
  | APPLICATION_SCOPE and PORTLET_SCOPE.
  | Any object stored in the session using the APPLICATION_SCOPE is available 
to any other
  | portlet that belongs to the same portlet application and that handles a 
request identified as
  | being a part of the same session.cx
  | Objects stored in the session using the PORTLET_SCOPE must be available to 
the portlet
  | during requests for the same portlet window that the objects where stored 
from.cxi The
  | object must be stored in the APPLICATION_SCOPE with the following 
fabricated attribute
  | name ?javax.portlet.p.?<ATTRIBUTE_NAME>?.  is a unique identification for
  | the portlet window (assigned by the portal/portlet-container) that must not 
contain a ???
  | character.cxii <ATTRIBUTE_NAME> is the attribute name used to set the 
object in the
  | PORTLET_SCOPE of the portlet session.
  | Attributes stored in the PORTLET_SCOPE are not protected from other web 
components of
  | the portlet application. They are just conveniently namespaced.
  | The setAttribute method of the PortletSession interface binds an object to 
the
  | session into the specified scope. For example:
  |         PortletSession session = request.getSession(true);
  |         URL url = new URL(?http://www.foo.com?);
  |         
session.setAttribute(?home.url?,url,PortletSession.APPLICATION_SCOPE);
  |         
session.setAttribute(?bkg.color?,?RED?,PortletSession.PORTLET_SCOPE);
  | 

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