Delphi 2010 Chat code for LAN

In delphi 5, I wrote a small server and client programs using the fastnet udp components.  I am now upgrading to delpgi 2010, and need to replace this functionality (as it appears the components were superceeded in (approx) delphi 2010).
Security is not an issue in this case - the "channel" is for my programs to pass program info - the users dont interact with it. The Server program also maintains a list of computers that are currently running the client.
I have been trying to get the 2010 Indy udp client \ server to work, and whilst it passes messages, I cant get the list of connected computers.
I'm not a particularly advanced programmer, so ideally I'm after a simple set of instructions.  Am I even looking at the right components?  Essentially all I want is a quick way of passing lines of text between specific computers.
Thanks in advance,
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