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1) You can detect it only the next time the visitor returns to your site.
2) It works only for the IE browsers.
The trick is simple. If a visitor request the favicon.ico file, he or she has bookmarked your site. Firefox requests this file everytime, while IE only if the URL is in the favorites.
Basically I'm trying to make sure visitors only bookmark the latest date dynamic page of some adverts where the url after the? determines the dates shown. Some of them are saving page 2,3 etc. by accident and then wondering why the adverts are a week out of date when they return.
The basic url is the same, with the stuff after the? changing to modify the dates.
So I was going to put a warning up if they try to bookmark page 2 onwards.
May have to code pages so that if they haven't arrived from our url, the page defaults to page 1.