2 Computers and one CD key?

I have a laptop and a desktop, i am wondering if i can use the same CD key provided with my disk (Mixvibes Cross LE that came with my Numark IDJ3) on both computers.
My laptop is a MB Pro, my desktop runs WinXP. I'm guessing the answer is no? My desktop is in my home office and i would like to practice on it as it holds the bulk of my music collection. I would like to use my laptop for more mobile use, ie. going to friend's house.
My laptop is a MB Pro, my desktop runs WinXP. I'm guessing the answer is no? My desktop is in my home office and i would like to practice on it as it holds the bulk of my music collection. I would like to use my laptop for more mobile use, ie. going to friend's house.