On my Thinkpad tablet, the lil blue Fn key next to the left-hand Ctrl. It's not actually necessary for F# keys...I have those. It seems to turn the F keys into

On my Thinkpad tablet, the lil blue Fn key next to the left-hand Ctrl. It's not actually necessary for F# keys...I have those. It seems to turn the F keys into other things...basing on the icons, I'm guessing sleep, alternate display toggle, brightness controls, eject (eject what? this computer has no optical drive). Actually...no. I hit that key on accident sometimes aiming for Ctrl. Not sure if it counts as being on the keyboard, but the least pressed button on this computer is the 'Access IBM' button. I don't even have the tools or whatever it's supposed to launch installed, this laptop's been completely wiped and replaced with win7. Scroll lock and Pause are definite runners up.