#1
Two hand tapping was popularized initially by Eddie Van Halen and was used by a lot of different guitar players. Try refraining from using too much because it has become somewhat a cliché. You can do some really cool stuff with it. This type of lick involves playing a power chord. It's all tapped.

So tapping the same notes with your left hand first then go an octave higher. Everything is tapped. The lick from Van Halen's erruptions triad and hammering on all the notes and then pulling off of the right hand. Once you do that you have a lot of possibilities. You can shift your whole hand to the left.

You can lower the bottom note. You can do any pattern with it.
#3
Thanks for telling me what I didn't know. You're doing these forums are great service.