Steve Jobs created Mac OS
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.
The Mac's operating system was originally known as the System Software. It later became known as Mac OS followed by a version number - Mac OS 7, Mac OS 8 etc. The current 10th version is known as Mac OS X.
If you have a Mac, it should already come up. If you don't, I have no clue!
To get out of a "Safe Boot" on any Mac just restart (reboot) the computer and it will restart into the original OS.
The Mac OS was designed by Apple as the operating system for their Macintosh range of computers. The first Mac OS, originally known as System Software, was introduced with the first Macintosh in 1984. Over the years the original Mac OS was developed, improved and expanded until Mac OS 9 in 2001. For version 10 Apple reworked the Mac OS around a UNIX core and this is known as Mac OS X.
You have to buy Mac OS X 10.5 Leopard from the store - you cannot download it from anywhere (that would be illegal).
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.
There are several differences between the original Mac OS and windows. Two of these differences include the fact that Widows was susceptible to viruses while Mac was not, and the MAC did not have menus in their windows. You could close a window and have the application still run. Windows had menus on each window and when the window was closed, the application stopped.
Mac OS X is an operating system released by Apple Inc. It is designed for Apple branded computers, which is why you will never see a Dell, or an HP computer run Mac OS X. There are only two important versions of Mac OS X, Mac OS X Server, and regular Mac OS X. Mac OS X server was designed for servers, while regular Mac OS X was designed for most computers. The current version of Mac OS X (10.6) is named Snow Leopard.
Mac OS X 10.4 (Tiger) needs to be purchased as it is not possible to update from Mac OS X 10.2.8