// returns true if success
static bool reactToWindowsKeyOpt(final Runnable r) {
  new Android3 a;
  a.startPort = 4989;
  a.useMultiPort = false; // We want the real port!
  a.responder = makeResponder(new O {
    S answer(S s) {
      new Matches m;
      if "windows key pressed"
        r.run();
      null;
    }
  });
  makeBot(a);
  if (a.port == a.startPort) {
    print("Windows key assigned.");
    true;
  }
  a.dispose();
  print("Could not assign Windows key (port " + a.startPort + " taken)");
  false;
}