> there are a howto about how to run X server on a guest machine ?
You might try running Xnest. There is a good example of this setup in
the Adios distribution. http://dc.qut.edu.au/adios/
Download latest at http://public.planetmirror.com/pub/adios/iso/adios4/
I recently used Adios in my presentation about UML at LinuxFest
Northwest. I would have found that all the tricks of setting up a UML
instance on my laptop rather tedious--Xnest, hostfs, scripts for running
multiple cow overlays--but Adios had it all preconfigured for me. I
just clicked on the UML button on the default login--four times--and up
came four UML instances. Felt like I was cheating :-)
Quite a sharp live cd distro, I quite like it! Great demo of UML 2.6.9
running on FC3.