Mac OS X is written in the programming languages C and Objective C.
No, the Registry is a feature of Microsoft Windows only. Neither the original Mac OS or the newer Mac OS X have ever used a Registry, Mac OS X is based on Unix which has never used a Registry.
Classic Mac OS games can be used in Mac OS X if the Mac is a PowerPC Mac, the game was written for PowerPC processors, and the version of Mac OS X is Tiger or older. They cannot be used on Intel Macs except via the use of a third-party emulator, such as SheepShaver.
Mac OS
Apple's Mac OS X can legally only be used on a computer made by Apple.
No. Apple only writes programming language in Mac OS X for Intel and PowerPC processors.
Re-install OS using the Install CD bundled with the laptop.
Mac OS X is the OS used on Apple's Macintosh computers.
Anything windows specific, such as .NET stuff.
Mac OS X - legally. Some people have altered the code in Mac OS X so that it can run on PC hardware (Hackint0sh)
Mac OS X is the operating system used by G5 Macs. The latest version of Mac OS X that will work on a G5 is Mac OS X 10.5 (also known as Leopard).
The main OS for Mac can be found on a Mac when it is switched on. The current main OS is called Mac OS X.
Mac OS X (ten)