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.
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.
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.
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 - 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 OS used on Apple's Macintosh computers.
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.
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.
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.