What are the levels of MAC OS X?

System Preferences can be located either from the Apple Menu, or the Dock icon which looks like a gearset.

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...

Macs are designed to function best with Mac OS X and the associated iLife software (iPhoto, iMovie etc.) but they can happily run Windows or Linux. Rather than change a Mac to the another operating...

No, for all of the Old World macs (pretty much MacOS 2.0 -9.2 ) you need the ROM image. The system needs the information on the ROM chip to run.

Mac OS X 10.4 (Tiger) needs to be purchased as it is not possible to update from Mac OS X 10.2.8