A network test has been released over at the JHexen site to see if the new client/server-like way of exchanging game data works. You'll need a 3+ player LAN for this.
Originally, networking in the Doom engine is based on a peer-to-peer system, whereeach computer is practically a server of its own, and sends game data ("ticcmds") toeach of the other computers. What I've done is that now each client sends it ticcmdsonly to the server, which is then responsible for distributing the ticcmds of each client to all the other clients. It is my hope that this will help at least a little when playing Internet games.
Instruction can be found at the JHexen site, as well as how to submit your feedback on what features. Please read this before you do anything. While you're there, check out fellow Telenation site Raven-Games for more Heretic/Hexen related goodiness!