for a lot of music programs- protools and especially Sibelius, there is a huge need to use the Numkey-pad numbers. using an external keypad is not comfortable.
In the older macbooks you had the possibility to use some of the letters- u i o etc. as the numbers of the keypad, but on the new ones (from 2008) they blocked this possibility.( I don't understand why)
Those any one knows how to use some of the bottons as numkeypad?