function Key()
{
	/**
	 * Indicates if this key is currently pressed.
	 *
	 * @property pressed
	 * @default false
	 * @type {boolean}
	 */
	this.pressed = false;

	/**
	 * Indicates if this key was just pressed.
	 *
	 * @property justPressed
	 * @default false
	 * @type {boolean}
	 */
	this.justPressed = false;
	
	/**
	 * Indicates if this key was just released.
	 *
	 * @property justReleased
	 * @default false
	 * @type {boolean}
	 */
	this.justReleased = false;
}
Key is used by Keyboard, Mouse, etc, to represent a key state.

@class Key
@module Input