Running multiple bots

I'm wondering what you guys are using to run more than 2 bots. I find that using VM is the only way that works, therefore I can only run 2.

Which VM r u using? and what OS do you have installed on them?

You can use VMware, Virtual Box, etc. VMWare workstation can have multiple virtual machines open at once.

You can pretty much use any Windows OS above XP.