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As our chat application gathers pace we return to the server side of the application. At this point we have setup the Zend Framework with an IndexController class to handle server requests. After the initial loading of our HTML interface, we will expect all further server requests to be issued via AJAX (courtesy of Prototype and the XMLHttpRequest object) on the client side. We'll see this in Part 5.

It's important to note that using AJAX requires no additional changes to the current design of our application on the server side. As usual our server side code will receive HTTP requests containing user data which will need to be filtered and validated - just another typical request. We should keep in mind that because requests are being made automatically by Javascript code in the client browser, the data contained in such requests is still user data, i.e. it must be filtered/validated server side.

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