I'm thinking of getting 2 computers to run 4 alts and running my main on my old computer (that can easily run wow)
I plan on using the monitor on my Alts computer rotated by 90deg (so they are higher then they are wide and having 2 copies of wow running on each computer one on top of the other.

My question is this:
What sort of spec PC am I looking for to run 2 copies of wow in lowest graphic settings? (I know I would need dual core but what other sort of spec am I after?)
Whats the smallest rez I can run a window copy of wow in? (noobish question I know)
If I use only software to transmit keyboard and mouse commands will it work with cross computer then cross window? if so how would I do this? if not what sort of hardware would I need?

I was feeling really mad could I run 4 copies of wow on one kick arse computer and have dual monitor out put to show 4 windows across 2 screens or have 4 windows on on screen? what sort of spec would I need for this? (I guess I would need a quad core CPU for this but what sort of spec and graphics card)