here is a technical question

How can i run 2 or more Xserver (or instance of) on the same computer, sharing the same screen (something like the 6 console under linux, but for the server)

Anyone ?

you mean you want to be able to use ctrl+alt+fsomething to change between two X servers? easy

startx -- :1

will start a second X server, putting it under F8 by default.

if you're just looking for a little extra desktop space, then i'd try using the workspaces in most window managers. you won't kill your system resources that way.

but if you're looking for multiple users in X, then the above is the way to go. :-)

yeah im searching multiple user
Is there's a way to load another config files instead of the default one ?

thanks for the previous fast answer !

well, if you're planning on doing it on a proper basis, you should set up your configs to sort themselves out automatically. if you've got a .Xclients file, it should read...

#!/bin/bash

# Created by Red Hat Desktop Switcher

if [ -e "$HOME/.Xclients-$HOSTNAME$DISPLAY" ]; then
exec $HOME/.Xclients-$HOSTNAME$DISPLAY
else
exec $HOME/.Xclients-default
fi

so by having that file (or a .xinitrc equivalent), you should then be able to have a .Xclients-mycomputer:0 and .Xclients-mycomputer:1 which will get chosen automatically depending on where you start the server (i.e. my first post)

what config file are you referring to? XF86Config? or your WM's config file. if you mean your WM's config file, then i suggest you man whatever WM you're using (for me, windowmaker. so "man wmaker").

if it's XF86Config, why would you want to load another one?