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I have 19 PC's running Ubuntu. I want 18 of these PCs to be able to send some message to the first PC. So, the first PC can receive all message from another PCs.

But, the 1 PC is not a server. It just a client but another client just send

I don't know which software I should use.

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You could use talk, a command-line based program for this purpose.

I believe it's installed by default, if not try sudo apt-get install inetutils-talk.

Package info found here.

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but this should be use terminal,isn't it? i want like some desktop app. And i worry to use because of this article – klox Feb 23 '11 at 3:20

Pidgin and Empathy support Bonjour network-local messaging. (avahi-daemon is needed.)

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