Virtual servers allow you, with a single installed server, to offer companies or individuals domain names, IP addresses, and some server administration capabilities. For the users, it is almost as if they have their own web server, though you provide the hardware and basic web server maintenance.
The settings for virtual servers are stored in the server.xml file, found in the server_root/server_id/config directory. You must not edit this file to use virtual servers, but if you would like to learn more about this file, see the Sun Java System Web Server 6.1 SP12 Administrator’s Configuration File Reference.
For more information about virtual servers, see Chapter 14, Using Virtual Servers.