ASP.NET AJAX
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Atlas is Microsoft's codename for a set of extensions to ASP.NET for implementing Ajax_(programming) functionality.
Including both client-side and server-side components, Atlas allows the developer to create rich web applications in ASP.NET 2.0 which can update data on the web page without a complete reload of the page (a "round trip" to the server). The key technology which enables this functionality is the XMLHttpRequest method.
As of this writing, Atlas is still in the developmental stage. More information is available at [1].