there are two types of artificial harmonics. the one that Fret Spider had made an excellent explanation on was called PINCH HARMONICS, which is more of a "hard rock" sounding harmonic. another type artificial harmonics i think is called the ARCH HARMONICS, i'm not sure what the correct name for that is. but this type of artificial harmonics are more for classical or jazz music. if you click on "country" under "by style" on the left of this website, then listen to debussy - girl with the flaxen hair, which is under one of the two free lessons, you'll get a good idea of what this type of articial harmonic is.

in order to perform the "arch" harmonics, you must master the natural harmonics. you can do natural harmonics in various frets on the guitar. the best ones are the 4th, 5th, 7th, 9th, and the 12th fret. NOW THIS IS VERY IMPORTANT: when you play a natural harmonic on a certain string on one of those frets, those harmonics give a certain pitch, not random ones, but fixed ones. FOR EXAMPLE: on a D string, if you do natural harmonic on the 12th fret, it will ring the D note on a higher octive of the open D string. and now lets say if you put a capo of the 2nd fret of the guitar, and now if you play the open D string, it wouldn't give you a D note but an E note (because the 2nd fret of the D string is the E note and you've just put a capo over the 2nd fret). now, in order to do a natural harmonic to make that E note on the D string one octave higher, you must do the natural harmonic on the 14th fret instead of the 12th. This is because what you're doing is you're counting 12th frets over from the E note on the second fret of the D string, which turns out to be the 14th fret. PUT IT IN SIMPLE MATH TERMS:

12 frets across = one octive
0 + 12 = 12 = D note
2 + 12 = 14 = E note

NOTE: YOU MUST UNDERSTAND THE CONCEPTS ABOVE BEFORE MOVING ON!

Now, here's the trick on how to do "arch" harmonics:
the idea of arch harmonics is as soon as you are fretting a note on your left hand, you are capoing a note! another words: YOUR FRETTING HAND IS THE CAPO, AND YOU'RE BASICALLY DOING NATURAL HARMONICS 12 FRETS ACROSS THE NOTES YOU FRET. For example, if you're fretting the 4th fret on the A string, which turns out to be the C# note, in order to do the natural harmonic one octive higher than that C#, you must do a natural harmonic 12 frets across, one the C# note that is one octive higher than the one you fret. and while you do the natural harmonic on that C#, your fret hand MUST securely press on to that C# note cuz remember, YOUR FRET HAND BECOMES THE CAPO! To try to not make things too confusing and complicated, here are some tabs that will help you:

This is how you do a C major chord arppegio in arch harmonics:

first, fret a C major chord:

E ---------
B ---- 1 ---
G ---- 0 ---
D ---- 2 ---
A ---- 3 ---
E ----------

now, try to play the C major chord arppegio slowly, one note after another:
NOTE: THIS ISN'T SWEEP PICKING AT ALL!

E -------------
B --------- 1 -
G ------- 0 ---
D ----- 2 ----
A --- 3 -------
E -------------

your last step, make sure you hang tight on your C major chord with your left hand. now, do natural harmonics 12 frets (one octive higher) across all these notes. do you that you should use your place your picking hand's index finger on the natural harmonic position and pick with your thumb underneath:

NH NH NH NH
E -------------------
B ------------- 13 --
G --------- 12 ------
D ----- 14 ----------
A -- 15 -------------
E -------------------

I know i may seem a little bit confusing on this but trust me it's tough to explain everything without pictures! i've tried my best! i hope i am a help to what you're looking for. If you still have questions, you can feel free to give me your e-mail and i'll send you some pictures on how to do it! i'll do my best to help!