here is a link may have more later , hope some time that we canj have a face recognition simular to this that will let hal use our web cam to see us and comment on colors of our shirt , or that we look happy (hal recognizing the turned up shape of our mouth ), etc.
http://chris.pirillo.com/2007/07/12/face-recognition-for-windows-login/as i said may find more links for people to read
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