Life in a computer

This was from a discussion on Facebook. Somebody suggested that we could become immortal, living in a computer. This is my post in answer. Living inside a computer would not be easy. Consider the problems of living inside your identical twin. A body that is genetically made from the same embryo as yours, split off early in development. (Would his consciousness be removed to put yours into his body?) So there you are in a body genetically identical to yours. Do you think you could adjust to life in there? Think about it. Then think, suppose instead of an identical human body, your consciousness is living in a machine. I wouldn't want that. Would you? After all, what would happen in a sudden power cut? Would you start up again when power is restored? Or just be a lost program? Perhaps in the future a brain transplant will become possible. But who will then be living in your body after the transplant? You, the original person, with a new improved brain, or the brain's donor in your body? With you in the discarded brain, just medical waste? We could write a book about this, couldn't we? "Fifty Shades of Human Machine Hybridization"