Chat without server

Hey,
I would like to create a chat that doesn't use a server. I know you can use MulticastSockets, which I intend to for some aspects.
What I would like to build is chat that uses the multicastsocket to see whos online. Then when I want to communicate to someone I open up a socket to that person - without using any server!
Any suggestions?

http://www.fawcette.com/javapro/2001_12/magazine/features/bkurniawan/default.asp
http://www.fawcette.com/javapro/2001_12/magazine/features/bkurniawan/default.asp
http://www-106.ibm.com/developerworks/java/library/j-p2pint1.html?t=gr,p=Jxta
http://chattutorial.jxta.org/
http://developer.java.sun.com/developer/technicalArticles/peer/
http://java.sun.com/products/java-media/jsdt/
maybe also,
http://www.onjava.com/pub/a/onjava/excerpt/jms_ch2/index.html?page=2
http://www.onjava.com/lpt/a//onjava/excerpt/jms_ch2/index.html

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