I think it's the button to the left of the home button in this : http://www.engadget.com/photos/hp-slate-hands-on/#3494151 http://www.engadget.com/photos/hp-sla

I think it's the button to the left of the home button in this : http://www.engadget.com/photos/hp-slate-hands-on/#3494151 http://www.engadget.com/photos/hp-slate-hands-on/#3494151