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What is NSHeartBeatThread?

I recently debugged my application in Tools, and one of the threads was NSHeartBeat (or something very similar). None of my methods have the words “heart” or “beaten” in them, so I assume that this is a system function. What is he doing?

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It animates the progress indicators and default buttons, maybe other things, I have never seen the complete list (it is not documented). Check out the discussion at http://cocoadev.com/wiki/NSUIHeartBeat

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