The AWT has been recently spec'd on how Caps-Lock and Num-Lock keys fire events: when a modifier is turned on a KEY_PRESSED is sent, and when it is turned off a KEY_RELEASED should be sent. Applications can determine the state of these modifiers by remembering the last KeyEvent fired with that keyCode.

On Win32, KEY_PRESSED is sent when the key is pressed, and KEY_RELEASED when
the key is released. This doesn't reflect the current state of the modifier.