Does someone knows where I can find a tutorial for Multizone Multiplayer ?
Thanks.

Check the tutorials on the Contiec site and from the AUM contests.
Not sure if there is something about multizone, but you need to understand basic multiplayer coding first anyway.

I am not sure what you mean by Multizone (Guild Wars or Runescape), but their just aren't that many multiplayer tutorials out their. I use Locoweeds MP tutorial, but Alians tutorial is very helpful also when you want to learn more about MP.

A6 isn't the most capable multiplayer client. You might want to get Populace, but I haven't checked it out.