Is there any way to lock the touchscreen and keyboard without having it shut the screen off? If I hit the "power" button (2nd button to the right of the five way), it of course (1) shuts the screen off and (2) locks the touchscreen and keyboard. But, if I hit the alt+power button, it then (1) locks the keyboard and touchscreen, and (2) shuts the screen off! It appears the only difference between these is the order in which they occur. And since they both happen immediately, it doesn't make a difference.

I would really like to keep the screen on and have the touchscreen and keyboard locked, but it appears there is no functional difference between using power and alt+power. Is there some additional setting I haven't found yet? And if not, why even bother with having the alt+power option, it could be used for something more useful.