Most introductory AJAX examples only have a single, globally defined XMLHttpRequest object. While this is ok for toy or sample applications, a real world application will probably have more than only one asynchronous request at a time.
Think for instance of an application that has to update several RSS feeds at a time (In Fold you can basically have an unlimited number of RSS containers on your index page.)
One solution for this problem that uses the object-oriented capabilites of JavaScript can be found in Ajax in Action by Crane, Pascarello.
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