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http://dhtmlnirvana.com/ajax/ajax_tutorial/

AJAX: How to Handle Bookmarks and Back Buttons by Brad Neuberg — The clever in-page dynamics of AJAX make for richer web applications, but they don’t necessarily tolerate the use of bookmarks or the browser’s back and forward buttons particularly well. In this article, Brad Neuberg shows off a new framework that brings bookmarking and back-button awareness to AJAX.