Originally Posted by: hunter60Both. He says, head hanging in shame. :(

Think about a C Major scale:

C D E F G A B C - the C you've gone up to is 1 octave higher than the one you started on. Check wikipedia here for the technical stuff if you're interested.

The rest of the discussion is how to use the structure of the fretboard to find notes. E.G. Fret 5 of the E string is an 'A'. Go two strings up, and two frets up, and fret 7 of the D sting is also an 'A'.... then taking the G string tuning into account it's 3 frets up next, so fret 10 of the G string is also an 'A'. There are multiple ways to find the octaves as Ian has shown previously...