According to http://news.ycombinator.com/item?id=5282855 http://news.ycombinator.com/item?id=5282855 it looks like they log in and get a session cookie for the

According to http://news.ycombinator.com/item?id=5282855 http://news.ycombinator.com/item?id=5282855 it looks like they log in and get a session cookie for the site on their side and send that to your browser.