title: how to post NSSystemDefined NSEvent
body: <p>I created a <code>NSEvent</code> and I want to post it. How can I do that?</p>
  
  <p>It is a <code>NSSystemDefined</code> type and I want to post it globally. Basically some <code>IOHIDPostEvent</code> or <code>CGEventPost</code> equivalent.</p>