Very small suggestion, it just tags everyone who is on at the moment and who has the permissions to lock threads, mostly used for threads where people incorrectly report things, and when the owner wants the thread locked. This is to save time for people, instead of having to look for a specific staff member and tag them, you only have to type the same 5 characters, if someone uses it wrongly then they lose their rights to it, reason being it could be used improperly to get staff viewing a thread, so unless the message is requesting a lock for the thread @lock would be unallowed (sorry for whoever has the forums name lock)