I tried to get some information on how to get the basic networking going on with bmax a while ago, but all the answers I got on the official forum wasn't really that useful, and they all more or less required that I knew everything about how UDP/TCP, sockets and such worked, which I don't, otherwise I probably wouldn't have asked in the first place. It seems to be one of the more difficult areas to find answers.
I wanted to make a small networked game, kinda like an oldschool MUD but where a handful of people could log onto a server that I would have running, where they could go on adventure and where I could update the server with new dungeons, quests and such. Unfortunately I have had a period where I have not had any time to spend on programming, which is also why all my other projects are on hold. But I really would like to get started again sometime sooner than later, so I will be needing to try it again with finding information on networking. So if I manage to kick myself into gear, then I will share what I find.
There is a module which comes with bmax called gnet, and its a networking module where objects are used to pack data that is transfered between computers. But I never managed to get something working with it. I remember looking for a thirdparty module, but not finding something that seemed like it was easy to get into for someone without specific networking knowledge.