In revelation that mark of the beast is more than just that what is understood because it is symbolic.. the mark that that was said their is the mark of people who receive his influence the devil.. the marking of the forehead are thought to be the character and the mark of the forehand are the Works of men.. so the mark of the beast are people who has the character of the Beast(satan). and their works.. =D
I dunno. We've had national identification numbers that can do exactly those things since 1936. Theyre called Social Security numbers. The only difference is that they arent yet part of our physical bodies.