Running a listen() socket server and PyGTK UI

[lf11 at deletethistomailme.andonet.com]

I have built a connection-sharing utility which signs online when the 
first client wishes to go online, and signs off when the last client finishes.  
Unfortunately, I don't know how to make the client listen constantly for 
data from the server, say a notification when a new user signs on.  
Currently, it only listens if it sends data first.

The problem is to run a constantly-running listen() server along with 
the GUI, and have the GUI update automatically when such an event 
occurs.

Could I have some feedback as to how to go about doing this?  
Examples are great, models are even better.

The URL for the program is http://www.linuxstart.com/~lf11/files/keepup.html.

Thanks!

 -lf