Help with a G4 Running OS 9

Okay guys I need your help. I have a friend who just bought a new G5 running OS X (10.3.8) and he also has a G4 running OS 9. He has Final Cut Pro on the G4 running OS 9. I know I can't pull Final Cut Pro off the G4 and dump it into to OS X. Is the best way to access Final Cut Pro on the G4 by setting up the G4 in target disk mode via firewire? If so would I hold the "T" key down while I reboot the G5 or while I reboot the G4? I am trying to get this guy out of 9 and into X.

He bought an upgrade for Final Cut Pro, but the upgrade is for Final Cut Pro running in OS X and not OS 9.

It has been so long since I have used OS 9 I have forgotten where everything is.