Board Thread:General Discussion/@comment-14138255-20131019173146/@comment-17732608-20131021024031

@Primsatic

As you can see, this is a simple way of letting a specific person know you're talking to them, by use of the 'at' sign.

I think this is really the only recourse to non-registered users, as I don't believe they can edit comments at all. I could be wrong, but that's how most of the forums I've been to in the past have worked.