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This is an abstract for a talk to be given at the Fifth Foresight Conference on Molecular Nanotechnology. There will be a link from here to the full article when it is available on the web.A first step towards practical atom-scale electronics would be a single-atom binary switch that is silicon based, can be made in large numbers, and is thermally robust. We are investigating the function of a single-hydrogen binary switch on H-passivated Si(100) and find that it meets these requirements. Obvious applications of the switch include an atom-scale register. Here, we discuss both the creation of a register as well as the addressing of single bits.