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Is the server or the client in control in AJAX?

AJAX techniques can be implemented by server only, client or, or even mix of both. It depends on what technology and architecture one chooses. When providing complete control to the server, the server ensures that the client pages are in sync with the server. Whereas, one could use javascript and apply AJAX at the client level through it. The most common approach is to use a mix of server side and client side control.