JimRob has installed software that monitors the IP address of computers and their respective nics. He's caught multiple "duplicate" posters and banned them as I think is appropriate.
I've raised this issue in the past - and when the Mods got involved, it always turned out to be one person with several and very often more than two, nics.
I'm a day late but I couldn't help but offer the suggestion.
Oppsie...I've registered the screen name "Musketball Barbossa" to use on Sept. 19th, "Talk Like a Pirate Day."