I’ve seen enough people launch System Preferences via the Apple menu to adjust a PowerBook’s display, sound, or keyboard options that I thought I should remind them of the following:
If you hold down the Option key and press F1 or F2, the Display system preference appears.
Option F3, F4, or F5 opens the Sound system preference.
And on my PowerBook, which features a backlit keyboard, pressing Option F8, F9, or F10 makes the Keyboard system preference appear.