Interface with xp while I am running Linux?

Hi friends, I was wondering is there any program available that let me interface with xp while I am running Linux? By that i mean, having the windows xp interface with the little green start menu at the corner, on one whole side of the Linux 3D cube. I have seen it on youtube. But didn’t understand which program does that?

I believe you would be looking for some virtualization software like WMware or others that will allow you to install and run a copy of XP under Linux.

On a side note, something new (and probably doomed if M$ finds out):