As far as I understand, the generated "more" link will take you to the second page of the articles where no articles of the first page are going to appear even

As far as I understand, the generated "more" link will take you to the second page of the articles where no articles of the first page are going to appear even if there should be pushed back to the second page because some new articles were posted in the mean time. Think of an always up-to-date list divided in two pages, clicking on the second page would take you to a list of links that you might already have seen on the first page. Here, the second page is kind of "frozen" in time, aka the session and only displays the rest of the links. I might be wrong though. What I don't know is why a "news.ycombinator.com/page/2" url design couldn't be handled with a client-side session and cookie and still offers the same feature.