I was just browsing around aimlessly when I stumbled upon the openMosix HOWTO. Hmm, I've not been involved with openMosix for quite some time now, but I thought of giving it a look. And I'm surprised to see that intro to hacking openMosix still quotes my mail!
There's also another FAQ there, which ports does openMosix use for communication so that firewalls are configured properly.
The promised code documentation was written, but I have it tucked somewhere in my backups. May be I'll rake it up when I get my home machine running.