The only problem is it slows things down becuase having to OS' running at the same time takes alot for your computer nevermind Fly. One thing thats great about it is how seamlessly you can go from your virtual machine (Windows OS) to your normal OS. It simply runs windows.in a window which has its pros and cons. Parallels is a program which allows you to run Windows (Xp or Vista but I recommend Xp) without having to reboot your system. Ok I would say the easist place to start would be with a parallels download which is what I used. Microsoft Windows Xp Pro SP2 (Must be SP2 to work unless you bought your copy of Xp) I have found a way to play FlyFF Version 9 on my mac and have decided to share my secret (or maybe not.) with you all.