The VB admins have acces to some mods named "Multiple registratinon detector" and "AE Detector". Now the 2nd mod actually stores a cookie in your machine. If it sees the cookie on your machine and you register a different account then you will get caught. So always use Opera or Firefox (Preferably Opera) for your adventure
and be sure to block any cookies from the site you are going to register.
Can anyone confirm this?