Many keyboards have indicator lights (LEDs) that light up when certain keys are active. An example of this is the Caps Lock key. When Caps Lock is pressed, its indicator light goes on.
For people with no or little eyesight, these indicator lights are of limited use. The ToggleKeys feature serves as the aural equivalent of such a light. When you make Num Lock, Caps Lock, or Scroll Lock active, the computer beeps once. When you deactivate the key, the computer beeps twice.
Check the ToggleKeys check box in the AccessX main window to turn this feature on and off.