WindowsXPUnderQemuHowTo - Community Ubuntu Documentation

QEmu can run an OS inside another OS - for example, Windows under Linux. QEmu uses kqemu, an acceleration driver included in Ubuntu 7.04 Feisty Fawn to run Windows at usable speed.
Ubuntu 7.04 Feisty Fawn also includes a new version of rdesktop that can be used to start individual desktop apps from the VM on your normal desktop.

Useful for those essential apps not yet available for Linux. Or maybe for testing web pages in IE when using Linux for development.