The Mac version allows users to train for either Mac or PC keypad layout,
including pretty good imitation of the big "+" key. Couldn't do vice versa
for the PC version, without having the user saw that key in two. :-)
If you try it, whether it's the Mac or Windows version, feel free to let
me know how you find it. (Especially, does the Mac version work OK on
Any suggestions on good types of promotions also appreciated!