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QEMU is a FAST! processor emulator using dynamic translation to achieve good
emulation speed.
QEMU has two operating modes:

    * Full system emulation. In this mode, QEMU emulates a full system
    (for example a PC), including a processor and various peripherials.
    It can be used to launch different Operating Systems without rebooting
    the PC or to debug system code.
    * User mode emulation (Linux host only). In this mode, QEMU can launch
    Linux processes compiled for one CPU on another CPU. It can be used to
    launch the Wine Windows API emulator or to ease cross-compilation and
    cross-debugging.

As QEMU requires no host kernel patches to run, it is very safe and easy to use.

WWW: http://wiki.qemu.org/Main_Page