(Key) is pressed, and will convert the signal to send to the part of the Keyboard buffer to save that Key has been pressed and the Keyboard controller to the System Software.
(Key) is pressed and converts the signal to send to the one in Key Keyboard buffer to any notes that are pressed and Keyboard controller sends to the System Software.
(Key) is pressed and the converted signal to be transmitted to the part of the Keyboard buffer to record any Key is pressed and Keyboard controller. Will be sent to the System Software.