Although your Mac works well right out of the box, there may be some aspects of the system that do not suit you. For example, you might not like the default desktop background or the layout of the Dock. For these and other changes, Mac OS X comes with a number of features that enable you to customize your Mac. Not only can you change the appearance of your Mac to suit your taste, but you can also change the way your Mac works to make it easier and more efficient for you to use.
Display System Preferences 186
Change the Desktop Background 188
Activate the Screen Saver 190
Set the Mac OS X Sleep Options ...