static void telnetFromConsoleTo(S host, int port) {
  telnetFromConsoleTo(talkTo(host, port));
}
  
static void telnetFromConsoleTo(final DialogIO io) {
  // output
  thread {
    S line;
    while ((line = readLine()) != null) {
      print("Sending: " + quote(line));
      io.sendLine(line);
    }
  }
  
  // input
  while (io.isStillConnected()) {
    if (io.waitForLine()) {
      S line = io.readLineNoBlock();
      print("> " + line);
    }
  }
  
  print();
  print("[logout]");
}