After pressing each of the
buttons on this computer and considering the results, I've found that there is no real way to tell whether or not they all have a function. Not without boring myself to tears, at any rate, and it simply isn't worth it.
Some of them work only when they have a reason to work. Such as the alphabet keys. They do nothing if there isn't a space to be typed in. Some seem to function only in combination with one another. Some suggest alternative functions by listing more than one character per key.
Some are very mysterious. What do these F-numeral buttons do? It's maddening.
I've come to the conclusion that muggles are mad.