See the next section, Customizing. Scanning allows you to run directly from the keyboard, without a mouse. Whenever you press the left or right arrow keys on your keyboard, a large marker appears on-screen. Continue to press the arrow key until it's where you want it. The Scanning mode is available at all times.
Sound Provides the same three options found under the sound option in the Preference dialog.
These settings are only temporary, however. To save preferences to disk, see the next section, Customizing. When you've made your changes, click the OK button. Increase difficulty by forcing user to calculate amount of change. Remove on-screen keypad, user must use keyboard.