QEMU for Windows and Knoppix

QEMU is a processor emulator developed firstly on linux and later ported to windows. It allows to run windows on linux or linux on windows. This feature is very useful for linux live cd, e.g. Knoppix, to let me run linux without rebooting windows. However, it is slower than commercial emulator like virtual pc or vmware. Booting knoppix on qemu on windows is easy as single click.