Open the appropriate pane in System Preferences to show the following items in the menu bar. Where System Preferences is not used specific instructions are given.
- AirPort: In the Network pane of System Preferences, click the Airport tab, then select "Show AirPort status in menu bar". 
Note: Available only on AirPort-compatible Mac OS X computers.
 - AppleScript Script Menu:   Double-click Script Menu.menu, which is located in /Applications/AppleScript.
 - Battery: In the Energy Saver pane  of System Preferences select "Show battery status in menu bar".
Note: Available only on portable Mac OS X computers.
 - Bluetooth: In the Bluetooth pane's Settings tab, select "Show Bluetooth status in the menu bar".
Note: Available only when compatible Bluetooth hardware is connected.
 - Clock: In the Data & Time pane's Menu Bar Clock tab, select "Show the date and time in the menu bar".
 - Displays: In the Displays pane of System Preferences, select "Show displays in menu bar".
 - Eject: This item allows you to open or close the optical drive tray, which may be useful if you use a third-party keyboard and the F12 key does not open the tray. To show this menu bar item, do the following:
1. Choose "Go to Folder" from the Finder's Go menu. 
2. Type or paste: /System/Library/CoreServices/Menu Extras 
3. In the Menu Extras folder, double-click "Eject.menu".
 - iChat: In iChat, choose Preferences from the iChat menu, click Accounts, then select "Show status in menu bar".
 - IrDA: In the Network pane of System Preferences, choose IrDA from the Show pop-up menu , click the IrDA Modem tab, then select "Show IrDA status in menu bar".  If IrDA does not appear in the Show menu, select Network Port Configurations, then select IrDA. 
Note: Available only on portable Mac OS X computers that include an IrDA port.
 - Lock Screen: In the Keychain application, choose View > Lock Screen.
 - PC Card: This item appears in the menu bar when a compatible PC Card is present.
Note: Available only for portable Mac OS X computers that include a PC Card slot.
 - PPP: In the Internet Connect application, select "Show modem status in menu bar".
 - PPPoE: In the Network pane of System Preferences, click the PPPoE tab, then select "Show PPPoE status in menu bar".
 - Volume: In the Sound pane of System Preferences, select "Show volume in menu bar"
 
Note: In Mac OS X 10.2, when you locate a menu extra bundle in the Finder (as in the instructions for AppleScript and Eject above) it appears as a folder. The bundle will not open as a folder. Instead, double-clicking on the bundle will activate it.