You can have your computer beep every time you press a modifier key (with StickyKeys on). Since pressing these keys latches, locks, or releases them, a beep can be a useful reminder that you've enabled or disabled a modifier. (It's easy to forget this in the course of normal typing.)
To enable this setting, check the "Sound when modifier pressed" check box in the Settings window. (See Figure B-4.)
When you check this box (in the Settings window), you allow yourself to turn off StickyKeys by pressing two modifiers at once (such as Control and Shift). Some people find this easier than clicking with a mouse or pressing Shift five times.