static void runInAllVMs(S programID) {
  print("Injecting program to all VMs...");
  
  // inject to VMs
  L<Injection> injections = injectToAll(programID);
  
  // wait until injections ended
  waitUntilInjectionsDone(injections);
  
  print("Getting output of " + l(injections) + " injection(s).");
  L<S> output = getOutputOfInjections(injections);
  for (int i = 0; i < l(injections); i++) {
    print();
    print("VM " + injections.get(i).vmPort + ":");
    print(rtrim(output.get(i)));
  }

  // release injections (TODO)
}