Funny... after I read about the registers of (natural) languages, that reminded me of the "registers" of pipe organs, which are quite similar in a way: it's still the same instrument, but sounds different depending on what register(s) you use. Except that in English these are called "stops" for some reason (as in "pull out all the stops" - which in the programming sense introduced in the article would mean a wild mix of programming styles, probably not something you'd want to see). Oh, well...