Menulets: The Missing Manual
Apple calls them Menu Extras, but Mac fans on the Internet have named the little menu-bar icons shown in Figure 3-9 menulets. These menu-bar icons are the direct descendants of the controls once found on the Mac OS 9 Control Strip or the Windows system tray—that is, 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.

Figure 3-9. In Mac OS X 10.2, Apple cracked down on the use of the right side of the menu bar. Only Apple is allowed to create menulets—much to the dismay of other software companies that once added handy icon/menus up here.
To summon the various menulets, you generally visit a certain pane of System Preferences (Chapter 8) and turn on a checkbox called, for example, “Show volume in menu bar.” Here’s where to find this magic on/off checkbox for each of the menulets, in the order shown in Figure 3-9:
Bluetooth status (for connecting to Bluetooth devices, “pairing” your Mac with a cellphone, and so on). To find the “Show” checkbox: Open System Preferences→ Network. From the “Show:” pop-up menu, choose Bluetooth. (It’s available only if you’ve installed Apple’s Bluetooth software.)
Eject disc. This one’s the oddball: There’s ...
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