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This protocol passes keyboard events to a component such as the PS2Keyboard component.
Events are only sent when the visualization window is in focus. Keyboard combinations that
are filtered by the host OS such as Ctrl+Alt+Del are not detected by
the visualization. See components/KeyCode.h for a list of ATKeyCode
The protocol behaviors are:
keyDown(ATKeyCode code) : void
keyUp(ATKeyCode code) : void