>Is there a universal way to always force a page has expired when a user presses back? The only thing in regards to that I have found is when this is a post. So, when this is not, it is somewhat difficult to make sure that all back browser requests will always have the page has expired message.
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>Is there a way to make sure that all back requests will never work?

Michel,

I found this article: http://www.dotnetbips.com/articles/displayarticle.aspx?id=288