This looks exactly like windows messenger which is normally disabled for security reasons.
Thanks for this article! I have been looking for how to do this via Growl for YEARS, and it has seemed insane to me that no simple GUI app existed to do exactly this. (You know, we used to use a similar function on AppleTalk with an app called Radiation -- designed to send prank system messages, but worked great as a LAN notifier.) What would it take to go this one more step and build a small app that showed a list of the local machines and allowed you to select one by name (rather than IP) to send your message to? I am not a programmer, and I would pay for that.
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