the method can do anything
    it likes (or nothing at all) with the sender.</p>

    <p>Here's a method that displays an alert dialog:</p>

    <pre>
(objc:defmethod #/greet: ((self greeter) (sender :id))
  (declare (ignore sender))
  (let ((title (%make-nsstring "Hello!"))
        (msg (%make-nsstring "Hello, World!"))
        (default-button (%make-nsstring "Hi!"))
        (alt-button (%make-nsstring "Hello!"))
        (other-button (%make-nsstring "Go Away")))
    (#_NSRunAlertPanel title msg default-bu