The _(GNU) <A HREF="http://www.gnu.org/software/hurd/hurd.html"
>HURD</A> is the GNU project's replacement for the *(Unix) *(OS) kernel.
It is built on top of GNU _(Mach)4. The project is still going on now, and they join Debian (_(Linux)) team to make an easy-to-install version of it.

Running on top of Mach should make it possible to run on multi-processors environments. Also it should give more flexibility to the system.
