upgrading

After playing with the gamesalad demo for a while, I have decided to use it for my next game. If I upgrade on my laptop this weekend at home, will I be able to use the resulting license at work as well, or should I wait until I get back to the office and upgrade on my desktop instead? I guess what I am asking is, can one register a license that works on your desktop and laptop, or does one need separate licenses for both?
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QS