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Certainly very interesting. Especially the use of JSON – available with all four methods by the way – looks very promising. I had not realized that JSON is a standard feature of JavaScript – an immensely compact way of defining an object and array structure. Any server side view – Servlet, JSP, etc. – can produce a text document that contains JSON based data. Absorbing that data from the responseText on the XmlHttpRequest object into the client side JavaScript variables is dead easy: var myObject = eval( “(” + req.responseText + “)”); will load the entire data structure that was sent in JSON notation in the HtppServletResponse in the JavaScript variable myObject.