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Mac OS X Leopard - ARCAism

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248<br />

CHAPTER 13 APPLICATION BASICS<br />

Starting the Installer<br />

An installer package is usually distributed on a disk image or even a CD or DVD. Upon opening<br />

the disk (image), you will usually see one or more packages (Figure 13-1). Double-clicking the<br />

package will begin the installer.<br />

Figure 13-1. The iWork installer package (actually an alias to the .mpkg file)<br />

NOTE There are two similar-appearing types of package files; some have the .pkg extension,<br />

and others have the .mpkg extension. The .mpkg files are special metapackages that generally<br />

contain a number of smaller .pkg files. The installation of both types will be similar; however,<br />

the .mpkg file often will have more available options<br />

When you double-click the installer package, <strong>Leopard</strong>’s Installer application will start and<br />

begin the installation process. One of the first things the Installer may do is check your system to<br />

verify it is suitable for installing the application (Figure 13-2).<br />

Figure 13-2. Some packages must check your system before they can begin the installation.<br />

After the system check (if necessary), the Installer will generally present you with a few<br />

screens of information about the application. This generally includes up to three items: an Introduction<br />

screen, a Read Me screen, and a Software License screen.

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