Handling healing on tank's view

[tripleboxed]

I handle healing through macros i have 2 basic macros my cleric uses to heal the tank and i made an ATG in ISBOXER to send his healing rotation as i spam my tank skills. its pretty basic he just spams heals on the tank the whole time im tanking stuff.

Question 1: What is ATG within isboxer where may i find it?

Question 2: What might be these two basic macros & may i test them myself?

Question 3:On your healer are your heal spells on spefic actionbars where you only place healing spells & buffs?

example below
Actionbar 1 Shift-1-0 for heals only.
Actionbar 2 Ctrl 1-0 for buffs only.

Now this is what i was thinking would be a good idea.