Well, I don't really know anything about it either, but I googled:
(using the quotes), and backtracked up the directory a bit, then read the "faq.html" file (in firefox, obviously), and it seems to be related to a program/application/system called TNOS, which is a dos-based radio packet program. tnode is one of the programs included in the entire package. You can dig into it more if you'd like:
there are more docs, just remove the faq.html, or even the /lantzdocs part, and see what you can find. Hope this helps.