[ Thanks to Flavio
Villanustre for this link. ]
“QEMU is an open source CPU and system emulator, similar in many
aspects to Bochs and other commercial emulators. Unlike many of
them, QEMU can achieve significatively faster emulation speeds
through dynamic instruction translation. Dynamic translation means
that every time QEMU finds a new set of instructions it translates
them to an equivalent set of native instructions for the host
processor, runs them and stores them in a cache, in case they need
to be reused later.“In recent versions (since version 0.7.0) QEMU can become a
virtualizer as well (similar to VMware) when the target CPU
(emulated system) is similar to the host CPU (real system), and the
host operating system is either Linux or Windows…”