Ok, this is how i resume this topic.

I have a dual core with a decent video card, 4 gig of ram, 2 monitors 22" install on the same card. I want to dual Boxing on the same computer 2 accounts with different class

1. I am copying my WoW folder to another folder and rename the folder.
2. I Install AutoHotkey and learn how to use it.. and setup the script as show on theAHK Topics
3. I start 2 copy of wow, enter my 2 accounts.
4. and i start the long task to setup my MACROS.

This is how i see it. I use Bartenders that give me 10 Bars of 12 slots. on tops of the 4 bars that come with wow

I set my main Toon on the Main screen and i set up my main bar with my own spell and ability on him, set my secondary on my second monitor using extended screen. and i set all the spell and ability i want to use on my second toon. This is how it complicate a bit. I set up macro i want to use on my main monitor but want the action to be done on my second toon, I key bind them with the ALT key and i put them on a second bar just dedicated for that toon on my second monitor, so from my main screen i have access to abilities of both toons but i dont create on my main toon the ALT key, just on my second. On my second screen i set my main toon on focus and create macros to assist focus or heal focus.