I was going to ask Mike to clarify that comment too, because if I read it correctly, it betrays a pretty serious misapprehension of both the logical need for keys and the physical implementation of them. But I wanted to give him the benefit of the doubt.
/*****************
If most people are not willing to see the difficulty, this is mainly because, consciously or unconsciously, they assume that it will be they who will settle these questions for the others, and because they are convinced of their own capacity to do this. -Friedrich August von Hayek
*****************/