I agree that, in that example, it's hard to think why one would want both. I not infrequently find it happening (that I want the same name with different capit

I agree that, in that example, it's hard to think why one would want both. I not infrequently find it happening (that I want the same name with different capitalisations to mean different things) in TeX, but that's probably not a good example of programming practice (and I can't think of a recent example anyway). It is probably most prevalent in mathematics, where, for example, one will often use `a` for the length of the side of a triangle opposite the angle labelled `A`. Again, though, it's fair to argue that good mathematical practice in naming variables is not good programming practice!