function MinibufferEvent(NAME) {
  function dispatchMessageEvent(name, obj) {
    var ev = document.createEvent('MessageEvent');
    ev.initMessageEvent(name, true, false, JSON.stringify(obj), NAME, '', null);
    document.dispatchEvent(ev);
  }
  // first
  var EVENT = GM_getValue('EVENT', NAME+'_'+Math.random().toString(36).substring(2));
  var AUTH = false;
  var AUTH_REJECTED = GM_getValue('AUTH_REJECTED', false);
  if (!AUTH_REJECTED) {
    AUTH_REJECTED = true;
    document.addEventListener(EVENT+'.CheckCallback', function callback(ev) {
      document.removeEventListener(ev.type, callback, false);
      AUTH_REJECTED = false;
      AUTH = true;
    }, false);
    dispatchMessageEvent(EVENT+'.Check', null);
    GM_setValue('AUTH_REJECTED', AUTH_REJECTED);
    if (!AUTH) {
      // not authentificated
      document.addEventListener(EVENT+'.AuthCallback', function callback(ev) {
        document.removeEventListener(ev.type, callback, false);
        AUTH = true;
      }, false);
      dispatchMessageEvent('Minibuffer.Auth', EVENT);
    }
    if (AUTH) {
      MinibufferEvent.dispatch = function MinibufferEventDispatch(name, obj, callback) {
        document.addEventListener(EVENT + '.Callback', function c(ev) {
          document.removeEventListener(ev.type, c, false);
          callback(ev);
        }, false);
        dispatchMessageEvent(EVENT, obj);
      }
    }
  }
}