User identification across many requests and transient information storage about the user is processed by PortletSession interace. One PortletSession is created per portlet application per client.
The PortletSession interface provides a way to identify a user across more than one request and to store transient information about that user.
The storing of information is defined in two scopes- APPLICATION_SCOPE and PORTLET_SCOPE.
APPLICATION_SCOPE: All the objects in the session are available to all portlets,servlets, JSPs of the same portlet application, by using APPLICATION_SCOPE.
PORTLET_SCOPE: All the objects in the session are available to the portlet during the requests for the same portlet window. The attributes persisted in the PORTLET_SCOPE are not protected from other web components. Source: CoolInterview.com
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