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On Mountain Lion, we use the Notification Centre by default although you can opt to use Growl if you would prefer. In Lion, only Growl is available (obviously) :)

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And are you poling the noti server? I'm wondering how realtime it is :-)

We use a socket-based connection on the clients. Messages should be delivered in very near to real-time. There's no polling here ;)

is this mac only?

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