My niece was poking away at my MacBook and somehow brought up System Preferences by clicking some combination in the bottom left of the keyboard. I think it may of involved the ~ key. Does anyone know what it might be as it would be very useful? Last week she managed to move the dock to the left of the screen instead of the bottom with what looked like a single keystroke. However there may of been some kind of trackpad swipe involved. Anyhoo... system preferences short cut, what is it?