If you know the notes at the nut (EADGBE) and you know the 12 note system, you can easily name every note on every string at every fret. The hard part comes in finding them in a split second (which is why I guess scotty_b memorized them. My dad, who was a guitarist , always told me to learn every note. I never did. I can find 'em though, just not that fast. I'm waiting for
Plane Talk to come so I can be enlightened!