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Joe,By your definition, a function key on a 5250 is a request from the user. In JSP Model 2 there is no functional difference between what the browser does (display information from the host, allow user to enter data, and then hit a button) and what the 5250 does (display information from the host, allow user to enter data, and hit a function key).
Again, model 1 or 2, the servlet is a server program. It's not that you can simply start a servlet which then displays a page. The output of a servlet is always in response to an HTTP request.
In model 2 simply more of the application code (like what page to display next) resides on the server. But it's still client/server.
You said "the SUBMIT button on the JSP page returns to the calling servlet.". It does not return. A SUBMIT is a request. It is the beginning of a request-reponse cycle, not the end. The framework simply assures that the SUBMIT request is delegated to the same servlet that produced the page containing the SUBMIT.
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