$Id tag in comment headers

Posted by Bernhard on Stack Overflow See other posts from Stack Overflow or by Bernhard
Published on 2010-03-19T09:29:41Z Indexed on 2010/03/19 9:31 UTC
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When I read source from open source projects I often find a comment line with "$Id" at the header of the file, f. ex.:

// $Id: addappwindowa.c 30792 2009-03-07 22:40:04Z neil $

Is there an "offical" syntax for this lines? (What does "30792" means? )
Are there editors that auto-generate these "$Id"s?
Are there any tools that use this information?

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