multiplexer.tgz is a Tcl "multiplexer" - or, in other words, a server that handles one-to-many comunication. One client sends it some data, and it sends that to all the other clients.  This version, by 

[CMcC] I have rewritten this as an incrtcl class called Mux, it can be found here: [http://sourceforge.net/projects/libtclpq/]