[sdrothrock]

I can't speak for Lenovo, but here's my experience with an Asus laptop.

When I use my right index finger to move the cursor around, if my palm nudges the palm rest, it usually activates some kind of gesture that switches to Metro.

If I use my right index finger to move the cursor around and my left index finger or thumb to click, then that activates some gesture that switches to metro.

If I'm typing and my palms touch the mousepad, that activates some gesture that switches to metro.

If you've never seen it once on your desktop, I would guess that it's because you don't have a touchpad that lets Windows interpret random touches as a "go to metro now!" command.

[pooper]

I won't say it works for everyone but on my Lenovo y510p, I can change the settings for the ELAN pointing device to disable my trackpad when there is an external mouse attached. If I have to use the computer for more than a few minutes, I make sure I plug in my mouse. (It isn't made to be an ultraportable / on top of a lap laptop notebook computer as the air intake is at the bottom.)

The surface would, of course, need to work well without a mouse. Perhaps the pen could be used as a pointing device in desktop mode as well?