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most sites will have the cookie over wrote with a new cookie when the surfer goes to a new affiliates page.
such as, if you (being the surfer) to go mysite.com/gallery1.html and click on the link to somepornsite.com, a cookie will go on your computer with mysite.com's affiliate id. say an hour later you go to myfriendssites.com/gallery87.html and click on a link to go to the SAME sponor - somesponsorsite.com, the cookie will be overwritten with the affiliate id from myfriendssite.com
or, at least affiliate cookie tracking works in most cases, especially with Nats.
some sponsors offer a 30 day cookie, but i believe that is if you send them to the sponsor page with your affiliate id, and they go back to the sponsor site WITHOUT clicking on your referral link, you will still get credit for the sale... i.e. if they bookmark and come back.
i do the same with call tracking numbers on pages so if someone book marks the page, we know what day the originally came in so we can track how long it takes for the conversion process
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