“Use other door. It's broken.”
—sign on donut shop door
System Preference Panes, hereinafter referred to as preference panes, are essentially plug-ins that are dynamically loaded by the System Preferences application. Preference panes and the System Preferences application allow users to alter systemwide settings using a standard host application. They live in the
/Library/PreferencePanes folder in any of the standard search paths, but when you install new ones yourself, you will most likely place them in your
~/Library/PreferencePanes folder. Figure 8.1 shows the System Preferences application's main window with a lot of available preference panes.
Preference panes are ...