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This is a great lead article about the possibilities of "retrocausality" i.e. the future affecting the past, or what it's originator John Cramer calls a "Quantum Handshake". See his 1996 article: npl.washington.edu/AV/altvw16.html and his "Light in Reverse Gear" article: npl.washington.edu/AV/altvw08.html talking about his Transactional interpretation of reality. I would also highly recommend John Gribbin's book Schrodinger's Kittens that introduced me to the idea.
What's happened now is that Cramer has devised a clever experiment to test it.
I reviewed Gribbin's book here: http://www1.dragonet.es/users/markbcki/gribbin.htm