I have an ibook G4 And my dad has an ibook G3 900mhz with 256 ram. he needs tiger to run program that won't run on his 10.2.8 OS. If I use my G4 ibook install disk to get him to tiger is there any problems i might run into? Will the G4 install disk install tiger properly, and should i register it with apple?? Because I will still be using my ibook with tiger on it , until leopard comes out. and if i don't register it will he be able to get updates?