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ASP.NET 2.0 AJAX 1.0 Extensions allows you to develop custom client controls that function purely on the client-side. Those controls are developed mainly by Javascript and some server-side coding. Once the custom client control is rendered on the client-side, all the functionalities involved in it will be executed on the client-side only. Any required resource from the server will be retreived asynchornously.
To learn more about developing custom client controls in the AJAX 1.0 Extensions, here is a set of useful links for articles and webcasts:
Links
Webcasts
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