To expand a little on what Alex said, if you are a user with status set to Administrator, you have the option to disable the user or ban the IP used for a post. These options show up on the left hand side of the post, along with the options to ban a user or IP from just the current forum. Banning an IP from the site will result in the user getting a "You are banned" page if they try to access it at all. Disabling a user will immediately log them out if they are logged in and will prevent that user from logging in.

Besides being an automatic moderator on all forums, these are the only two abilities given.

As Alex said, if you are a moderator on every forum you could ban the user from every forum anyway, accomplishing almost exactly the same thing.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com