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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.
Providing a Mac mini is running Mac OS X 10.5 (Leopard) it can be used to make iPhone apps. Apple provides separate versions of the iPhone Software Development Kit for Leopard and Snow Leopard. The SDK requires the Xcode development tools which are included with the Mac OS X installation disc.
Mac OS
Apple's Mac OS X can legally only be used on a computer made by Apple.
Mac OS X - no doubt about it.
The 4 Applications that were released were: 1. iTunes 2. iMovie 3. iPhoto 4. iDVD All of these were created to run on OS 9 until OSX came out. All Mac OSX Releases (in order): -Mac OS X Server 1.0 "Hera" -Mac OS X Public Beta "Kodiak" -Mac OS X 10.0 "Cheetah" -Mac OS X 10.1 "Puma" -Mac OS X 10.2 "Jaguar" -Mac OS X 10.3 "Panther" -Mac OS X 10.4 "Tiger" -Mac OS X 10.5 "Leopard" -Mac OS X 10.6 "Snow Leopard" -Mac OS X 10.7 "Cougar" (still in development, scheduled for 2011 release)
Mac OS X is the OS used on Apple's Macintosh computers.
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 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.