Create Web modules by assembling...
Deploy the Web module as a stand-alone Web app, or combine it with other modules to create Java EE applications.
Use the Session Manager to manage HTTP sessions. A session is a series of requests to a servlet, originating from the same user at the same browser. Managing HTTP sessions allows servlets running in a Web container to keep track of individual users.
A servlet might use sessions to provide "shopping carts" to on-line shoppers. The servlet associates incoming requests with particular shoppers.