I just did this search
Because I wanted to find all questions with both php and windows-authentication.
So I ran the search and got the page with 4 results.
When I waited for a bit I saw that there were some new questions with activity:
But when I click on it, the new questions do not completely have to do with my query:
None of those updated have to do with windows-authentication. And then when I refresh the page again, it is back down to the 4 that I had originally found.