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procedure TfrmServer.FormCreate(Sender: TObject);
begin
  TCPServer.Active := True;
end;
procedure TfrmServer.TCPServerExecute(AThread: TIdPeerThread);
begin
  with AThread.Connection do
  begin
    WriteLn('Hello from Basic Indy Server server.');
    Disconnect;
  end;
end;					

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procedure TForm2.btnGoClick(Sender: TObject);
begin
  with TCPClient do begin
    Connect;
    try
      lstMain.Items.Add(ReadLn);
    finally
      Disconnect;
    end;
  end;
end;