This was a failed experiment (read: failed assignment!)

WARNING: don't press other buttons, or wierd thing will happen        


A / Z : inc/dec subdivision iterations

curve type:
W : bezier mode (default)
E : bspline mode

editing:
M : move vertex mode
N : add vertex mode (default)

extra:
If you want to clear the screen (erase all points) then press Q then press one of W or E
if you press Q more than once .. I don't know what will happen.