One may think that making use of this twist it is possible to send information to the past despite of the causality. Of course this is wrong http://www.kuee.kyoto-u.ac.jp/~kitano/paper/slp2/slp2.pdf http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F2944%2F26754%2F01193073.pdf%3Farnumber%3D1193073&authDecision=-203