http://www.macnn.com/articles/02/05/14/quickpopup.3.0.1:/
QuickPopup 3.0.1: messages across networks
updated 03:35 pm EDT, Tue May 14, 2002
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QuickPopup v3.0.1 allows users to exchange popup messages over corporate, school or home networks without being connected to the internet. It is compatible with Mac OS 9 & X as well as Windows. The upgrade improves reliability and speed on the OS X version as well as adding compatibility with the next release of OS X, Jaguar; pricing starts at $15 per license.
