From the sounds of it, this module he is creating is mosterous.
First off, from what I understand, UPD sockets where prepped to be implimented in the last release of Tcl. However, they seemed to have vanished at the last second (so I hear).
There should be a Tcl package however, that will allow you to use UDP sockets.
I'm on Quakenet, usually as Photon2k - you can find me in #byrtcw if I'm online.
I dont think my module will be any use to you though, as its specifically designed for making connections and sending packets to game servers, not just making any connection to any machine and sending any packet ...
I could possibly bang something together that would do that and interface to tcl as well, but I would have to finish that project first. In the meantime I could show you how to do it, but you'd have to code your own module.