For now, the frameworks available for creating these applications have been complex and have separated the development of client side Ajax (on the user? Machine s)? From the server? Side supporting technology (on the company s machine?). ASP.NET AJAX (formerly code? Named Atlas) is a set of extensions to existing ASP.NET 2.0 technology that provides you with an environment that fast-and-simple to create Ajax applications. Microsoft has combined Ajax with ASP.NET technology and provide a set of integrated development tools in Visual Studio 2005. For the first time, Ajax applications can be developed seamlessly in conjunction with assistive technologies. Foundations of ASP.NET AJAX (written by Laurence Moroney the author of Apress successful Foundations of Atlas) gives a detailed foundation in how ASP.NET AJAX works.