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Model View Controller scheme.

                  +-----------------------------------+
                  |                                   |
   User           |  Action Servlet->                 |
   PC             |  (Controller)                     |
HTTP request  ->  |                                   |
HTTP response <-  |       forward                     |
                  |         >                         |
                  |      JSP ->         JavaBeans ->  |
                  |      (View)   <->    Model        |<->   Data
                  |                                   |       DB
                  +-----------------------------------+