ON Mon, Aug 26, 2002 at 09:36:23AM -0500, Raymond Norton wrote: 
> I have a tech on one of our LAN's asking me for a software tool to monitor
> his network. He feels something is awry, and is asking me to help him find
> areas of congestion, services running, and bandwidth used. Is there a tool
> with a GUI for this?

I think the name of the tool you're looking for is "packet sniffer". 
One such program is Ethereal: 

http://www.ethereal.com/

Another sort of tool, useful for determining the services running on any
reachable network, is a port scanner such as nmap:

http://www.insecure.org/nmap/

-- 
Michael