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It's probably using some high-level Cocoa network framework, and not kernel-level functionality like netstat does. So my guess is only apps using the same high-level net framework are listed.

Actually, it does use kernel-level connection tracking.

why Lion-only then?

Because of the user interface. It's a dumb issue, but Lion changed the way table views work. Getting from 0 to MVP was about twice as fast with the new Lion features.

It's something I consider improving, though. Fundamentally, the same app should work on 10.6 too.

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