• derived nodes inherit all messages from their base classes
  
• see reset method for default settings
  
• the keys detected include most keyboard keys except function and keypad keys
  

constructor keyboard

destructor ~keyboard

method reset

1 set the previous state of all keys to 0

method app

1 for each possible key

1.1 if the state has changed then generate a key event

1.1.1 the key concatenated with the word "key" (i.e. akey, 1key)
1.1.2 the key name has been pressed