[quote name=\'That Don Guy\' post=\'159141\' date=\'Jul 30 2007, 09:16 PM\']
A little bit of both, I think - early on after the switch to the touch screens, they had Pat touch a screen to no effect, followed by Vanna touching the screen and the letter appearing.
[/quote]
That was on the first touch-puzzleboard ep, and it was mentioned at some point, not on the show but somewhere else I think, that the touch-sensitive mechanism is only on the right edge of the screen. If you watch that clip again, you'll note that Pat is smacking the left edge with all his strength and nothing happens, while Vanna gracefully taps the right side and it magically pops up.