title: See what process is accessing a file in Mac OS X
body: <p><strong>Note:</strong> This quesiton is <strong>NOT</strong> show me which files are in use. The file is not currently in use. The file will be in use at some unknown point in the future. At that point, I want to know what process accessed the file.</p>
  <p>I would like to be able to track a file and see which process is touching that file.  Is that possible?  I know that I can see the list of open processes in activity monitor but I think it's happening to quickly for me to see it.  The reason for this is I'm using a framework and I think the system version of the framework is being used instead of the debug version and I'd like to see which process is touching it.</p>