Apple's Mac OS X can legally only be used on a computer made by Apple.
legally, only apple made computers, but there are "hackintoshes", pcs that use MAC OS X
A Mac is a personal computer (PC) so the question is meaningless. Apple's Mac PCs can run Mac OS X whereas PCs produced by other companies cannot.
PCs are way better then Macs but Macs are PCs so the question is meaningless. If the questioner wanted to compare PCs that run the Windows operating system and those that run Mac OS X the question remains meaningless as Macs can run Windows as well as Mac OS X if required.
The main difference between Macs and PCs is the operating system. The Mac OS is easy to use and efficient. Windows doesn't have the simplicity and is more prone to viruses.
Apple created their operating system for their Macintosh range of computers and have decided not to make Mac OS X available for installation on any other brand of computer.
An operating system such as Window or 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.
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.
The Darwin kernel of Mac OS X is open source, as are many other parts of the OS. (See links below) but Mac OS X itself is not open source and Apple only allows it to run on Apple hardware.
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
The 2 main operating systems using on computers are Microsoft Windows and Apple Mac OS. Windows is available on all PCs and Mac OS is available on any Apple Computer.