So if I ban him by IP (he's on aol, and I really don't like banning aol ips for obvious reasons), I could do that for a few minutes until I know he's out....

I could unban that IP later, and then would he have to relog in, or would the cookie still stay and allow him to view the board even though I've changed all his info - password, and email addy?

What would be really nice is a way to log him out...??

I'll do the ip trick next time it happens though.....