Some game publishers send USB dongles with a demo version Guild wars platinum or the still tested/not finished version of a game, to be seen and evaluated. If the dongle isn't plugged in the game, this is not operable. This sparked a brilliant yet simple idea at Blizzard to use this sort of device in protecting your Wow account from Trojans and key loggers. All you have to do is connect the device and you automatically log on with no risk of leaving your id and password in someone else's hands.