First, some history frameworks, such as Dojo, use JavaScript objects to store an internal representation of the state of an AJAX application's history; unfortunately, browsers completely clear out all JavaScript objects when a user leaves a page. If a user interacts with an AJAX application, navigates to Google, and then returns to their original AJAX page, the AJAX history framework's internal state is erased and becomes confused.
Finally, I have not seen an AJAX history framework that will detect when a user has manually entered a new hash location in Internet Explorer.
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