Menulets: The Missing Manual
See the menu-bar icons in Figure 4-9? Apple calls them Menu Extras, but Mac fans on the Internet have named menulets. Each is both an indicator and a menu that provides direct access to certain settings in System Preferences. One lets you adjust your Mac's speaker volume; another lets you change the screen resolution; another shows you the remaining power in your laptop battery; and so on.
To summon the various menulets, you generally visit a certain pane of System Preferences (Chapter 9) and turn on a checkbox called, for example, "Show volume in menu bar." Here's a rundown of the various Apple menulets that you may encounter, complete with instructions on where to find this magic on/off checkbox for each.
Tip
The following descriptions indicate the official, authorized steps for installing a menulet. There is, however, a single folder on your hard drive that contains all 23 of them in a single window, so that you can install one with a quick double-click. To find them, open your hard drive → System → Library → CoreServices → Menu Extras folder.

Figure 4-9. These little guys are the direct descendants of the controls once found on the Mac OS 9 Control Strip or the Windows system tray. Menulets from left: Eject, VPN, Text Input, Remote Desktop, PPP, Ink, iChat, Classic, Bluetooth, AirPort, Volume, Battery, and Date & Time.
AirPort lets you turn your AirPort ...
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