No, Spacko, artificial harmonics can be done on any fret and any string. Read my previous post and iamthe_eggman's post. We're both talking about the same thing. That is what artificial harmonics are. It's really hard to explain it any better without some sort of visual aid. I suggest that you master other techniques before you tackle artificial harmonics. They're not super hard, but it helps if you have a solid grasp of other techniques and fretboard dexterity.