where have detailed information Zone/Multiserver

Zone/Multiserver is (this is what i believe because I have never been to shure) the ability to either run multiple server programs on 1 computer OR make multiple servers on different computers and have you be able to switch between the 2

This isn't a 3DGS specific topic. This refers to the network model used for multiplayer internet games.

I suggest you go buy a intro book on game design or multiplayer game design; you'll find way much info there

Zone / Multiserver allows you to break up your multiplayer game into smaller 'zones' or levels. You effectivly host each zone seperatly (although you can do it on the same server machine). This allows you cut down on how many players are in a given area which can help increase your network performance. For instance you break an outdoor level into 2 zones the first zone is of the main city streets and the second zone is an area such as a large castle. You can run both of these zones on the same server but each client only connects to the zone that they are in. Once they reach the end of one zone you can get gamestudio to connect and load up the second zone. This way not so many players occupy a very large area so there is less data that needs to be sent to each client. It effectivly allows you to break up a large area in a mutiplayer game into seperate levels, you can then switch between these levels by connecting to a different server session.