You would think so, right? But I think HPs must use some sort of different system for sensing the movement than Dells do because HPs really don't register a thumb movement (the side of my thumb) instead of the pad of a fingertip, regardless of pressure or warmth or anything. If you up the sensitivity levels to 100%, it comes close to the sensitivity of a Dell in that it can acknowledge the movement, but then it jumps around like mad. Move one step down the scale to 90%, and it says 'Thumb? What thumb? You don't need no stinkin' thumbs!'

Or, at least this was the case on my mother's computer; the ones at the stores didn't allow access to the control panel so I couldn't adjust their settings, but, all had a similar baseline level of not recognizing the movement of my thumb.