Using multiple keyboards with different keyboard layouts in Windows

I'd like to use multiple keyboards (all USB or one USB and one PS/2) with a different keyboard layout on each. Is this possible in Windows 7 or XP?

I'd prefer to avoid a hardware-based solution if possible.

My specific issue is that I prefer to use a Dvorak layout, but most of my colleagues use QWERTY. I'd quite like it if they could use my computer with a QWERTY layout by using a second keyboard, without affecting the layout of the primary one.