The Mac OS is the operating system that runs a Macintosh computer. First introduced in 1984 it is now in it's tenth version which is known as Mac OS X. It is used by programmers to provide a standard means of communication between their software and the Mac's hardware. It is used by users to manage and organise their work.
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.
Mac OS X is written in the programming languages C and Objective C.
Mac OS X is the OS used on Apple's Macintosh computers.
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).
Mac OS X (ten)
I have a Mac OS X but I know Mac OS is a computer made by the brand/company, Apple.
The second name of Mac OS X v10.4.5 is Mac OS X v10.4 Intel.Mac OS X 10.4 was known as Mac OS X Tiger.
You cannot without erasing your hard drive and installing Mac OS 9 from scratch. Even then Mac OS 9 may not run on modern Mac hardware because Mac OS 9 needs the ROM chip to boot. Modern Mac OS X hardware uses EFI to boot the system instead of a ROM chip to boot. Mac OS X v10.0 - Mac OS X v10.4 support Mac OS 9 applications and can run them, you just need to install the Mac OS 9 compatibility program which can be found on the Mac OS X Install CD.