HN does actually use a cookie called "user" when you login to keep you logged in. But for page to page state it uses an id in the url. That's why a lot of the i

HN does actually use a cookie called "user" when you login to keep you logged in. But for page to page state it uses an id in the url. That's why a lot of the internal links have a "fnid" in them and why you can't share those urls.