cigi63,
Yes, this was tricky for us, as there weren't universal
symbols for all of the windows keys that would fit. We don't have
different symbols per platform. The Control key (windows specific)
is the c with a circle around it. The alt key is the one with the
diagonal with a little dash on the top (and I believe you're right
this is Mac convention). That said, spacebar and arrowkeys are
pretty obvious I think. Best way to get used to these is to just
hold down the different keys, to see what highlights.