I am just getting into dual boxing, currently I just have my one computer and I can run 2-3 clients at once with low settings.

I have two moniters

I read the guides but couldnt figure something out. Like I said I only have one computer right now (i will be building 4 more with my dad when hes back from japan next month) anyway is it possible to dual box with the one computer? If so what would the hardware be? I read Xzin's post but wasnt sure if I would need to buy any of it yet if I only have one box