Bluetooth Passport is a remote keyless system for PC. It's unnecessary to input user name and password which is always being complex with keyboard and mouse to logon system any more. Your cell phone can help you logon Windows automatically. The computer which has been installed Bluetooth Passport can know its user, just like a clever puppy knows his master.
Most Trojan houses and spyware steal password by hooking keyboard messages. Bluetooth Passport can help you to logon system without press any key. After you leave your computer, it even help you to lock system automatically.