They're back [ or so I strongly suspect ] Options

[Hellfighter]

Hi... I believe the infamous jeep tk'rs are still around - same jeep M.O. and sounds like rats too when they chatted. Last occurence was yesterday 7;50 pm EST in Barby server[time limit]. They came on as >nOb Conductor< ,and nOb'Quarashi< Screenshots below show the actual sequence when they went after me in spawn - even knowing I was taking screenshots! Last one shows the dope bailing out of jeep.

[Druid]

There is one or two PB supported games which uses the player's MAC address when it computes the players GUID. Your MAC address is a number burned into the ROM on your network card.
There is ways for a player to spoof or even change their MAC address, which then changes their GUID.
This is not the case in the COD games, your GUID is computed using your cd-key.
The only way to get a new GUID is to buy a new legit copy of the game, cd-keys generators don't give valid keys so you don't get a valid GUID.

I know in the past their were people trying to write programs that would try to spoof a players GUID.
For this reason and in several other ways people were trying to bypass PB,. June 2004 PunkBuster introduced global Hardware bans. Global hardware bans uses a separate GUID bases on several pieces of hardware on the players computer, much the same as Microsoft's activation key.
If a player is detected trying to bypass PB, they are added to the global hardware ban.
The end effect is, the player is blocked from joining any server supporting PB, regardless of the game.