Create a chat room

[Jo-Erlend Schinstad]

Perhaps you can do that with link-local XMPP, aka Bonjour? If not,
then I can recommend using OpenFire. This is a free software XMPP
server written in Java. It can integrate with your LDAP directory to
automate setups of user accounts and pre-populate contact lists, etc.
It also supports chat rooms.