"[Science fiction] is the only kind of writing that allows you to look at the world we live in and change one piece at a time."
The wrist seems like a very traditional place to have a device used for entering commands; watch computers have been around since the early 1970's. However, it is a very functional place for people (or beings) with two appendages. For one thing, you can actually see it. If, as is the case with the Star Trek Generations emblems (on the upper chest) you can't get any visual feedback from them.
Today, it is possible to see a variety of wrist-mounted networked mobile computers in use in industrial or service businesses. Although a calculator is only one of the functions that a Wrist Command device might have, it is one of the first non-time related functions first put in a watch. See The Pulsar Watch Calculator, the first such watch. I actually owned one of these; alas, it was stolen many years ago - it was a beauty! The stainless steel version cost $625 in 1976.
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