Well I understand it now. It creates a list whenever I search, and it saves the list. So like if I Search: New Posts and it comes up with three pages. And I spend 46 minutes going through threads on page one (go to a thread, post, hit the back button, etc.) page two won't have to be dynamically created again, it'll just remember all the threads that were originally meant to be on page two, even if the search is 46 minutes old (i.e. no more of that "Your search returned no results" because I took too long doofing around on page one of the search [but apparently it expires at some point?]) I like this.