PokerTracker

Hi,
I read in the instructions that it's possible to use PT's registration code in 2 computers. I installed in my Macbook pt3 (the version 4 is not available for mac). I bought a PC for work and I want to install it on that.
Is it possible to use PT3 in one computer and PT4 in the second one?
What if I use both computers at the same time?

PT4 registration codes are distinct from PT3 registration codes and use of one doesn't affect the use of the other. Having purchased PT3 now you are entitled to a free PT4 code so you can just claim that and use it on your work PC and switch to PT4: Mac when it's available.