Who's There? 2.1 included a number of highly useful new features, along with integration with the DoorStop X Firewall and the latest version of our book Internet Security for Your Macintosh and iPhone: A Guide for the Rest of Us and its associated blog. Who's There? 2.3 adds support for Snow Leopard (Mac OS X 10.6) and its many enhanced networking services. It also includes access to our Twitter stream

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