New to multiboxing.

[Syp]

Hey guys,

I am doing 3x Exp with a friend but he has recently gone back to school and he asked me to level his character. Seeing as both of our characters are in the mid 40's i thought i could carry on 3x exping. As i dont want the hassle of leveling his character aswell i thought i could dual box if that makes any sense :P. (lifestoryyyy)

Basically i'm wondering what software, addons, or anything i need to get it up and running.

thanks

EDIT: I use mac.