I thought that this was such a basic question - one that would be so commonly asked - that I searched and searched, but could not find an answer. What exactly do the F Keys do? Do they also change based on what program you are using? In Finder, F12 brings up Dashboard; F11 clears the desktop; F10 activates Expose; F9 also activates Expose; F8 activates Spaces; F7; F6; F5; F4; F3; F2; F1. I wonder why F10 and F11 are the same? **EDIT** - now I'm even more confused. Sometimes, F10 activates Expose, but other times (e.g., when I'm in the Expose & Spaces of System Prefs), it highlights the top window and darkens the background. First, why is it doing that there as opposed to other times. Second, what in the world is the highlighting/darkening thing doing? In Firefox, I know F5 refreshes, and I think F6 highlights the URL bar? Thanks for any help.