My x61t doesn't have that function, but I think I saw it in one of the video review for x220t or x220. I guess if security is important, then it might be useful. Since I'm a student, I don't have any password on my tablet just in case of theft. It'll be easier to recover the laptop if the thief doesn't reinstall windows. Even if he does, it'll be traceable, since I have computrace service.