case "check":
                    if (parameters.Length > 1)
                    {
                        String s = "Server is ";

                        IPHostEntry entry = Dns.GetHostEntry(parameters[0]);


                        AutoResetEvent connectDone = new AutoResetEvent(false);

                        TcpClient c = new TcpClient();

                        c.BeginConnect(
                            entry.AddressList[0], int.Parse(parameters[1]),
                            new AsyncCallback(
                                delegate(IAsyncResult ar)
                                {
                                    try
                                    {
                                        c.EndConnect(ar);
                                        connectDone.Set();
                                    }
                                    catch (Exception e)
                                    {
                                        client.LocalUser.SendMessage(target.Name, "Exception: " + e.Message);
                                    }
                                }
                            ), c
                        );

                        if (!connectDone.WaitOne(2000))
                        {
                            c.Close();
                            s += "down";
                        }
                        else
                        {
                            c.Close();
                            s += "up";
                        }



                        client.LocalUser.SendMessage(target, s);
                    }
                    break;