No Lock Begging - There is no need to request that a topic be locked simply because the original poster (you or another) has had his request fufilled. If there are other people who have more to add, they will do so; otherwise, the topic will simply fall to the bottom naturally with no intervention. If the topic needs to be locked, it usually will be. Violation of this will result in a Warning.
I would guess by being observant enough to note a sudden drop in the number of Registered Users, displayed at the bottom of the page, generated by a file called overall_footer.tpl, I imagine.