What's the program that allows you to run Windows 95 -> 2000 on top of Linux?

[BowDown]

Just as the title states... I want to run Linux as my primary OS and run Windows 2000 in a Window on top of Linux. Anyone know the name of the program that made this possible?

 

[Doh!]

VMware

 

[thommy]

I think there's also one called Win4Lin, though I read somewhere it needs a special kernel mods.

 

[BowDown]

K, thought it was VM something. Thanks .