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For instance, imagine a small order processing system that could be visualized like this:

Panel

                               ORDWRK
                                     |
                      ----

No Format
                         ORDWRK                             |                      

------|---------

                    |       |       |                   ORD001  ORD002  ORD003

...

-
                     |               |              |
              ORD001  ORD002  ORD003

When a user enters this system and begins jumping from ORD001 to ORD002 to ORD003, and so on, a fair amount of computer resource can be wasted opening and closing files used by all the functions.

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