Okay I don't know why this isn't there, but I saw a new player asking about this the other day and wanted to know more about it myself.

Why doesn't the in-game Toribash client have a log out button?

I mean its a pretty simple function and I would hate to log into my account at a friend's house and then find out he was playing around on my account later because I can't log out of his client or for someone to access my account on my computer when I'm away and mess with stuff.