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Are there any programs that can be used to chat between Windows and Mac OS machines without a central server?

Perhaps something like Pidgin exists that can be configured for this?

I'd like to set this up at home so that everyone can talk to each other but I want it to be an "internal" chat system run through our router.

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up vote 2 down vote accepted

Pidgin can do this via the Bonjour (or "ZeroConf") protocol. read more about that at

On the Mac your IChat has support for Bonjour built in, on Windows / Linux you can use Pidgin or other clients which support Bonjour.

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