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procedure TForm1.Button1Click(Sender: TObject);
begin
  with IdTCPClient1 do begin
    Connect;
    try
      Listbox1.Items.Add(ReadLn);
      WriteLn('Hello from Basic Indy Client.');
      Listbox1.Items.Add(ReadLn);
      WriteLn('Go away!');
    finally
      Disconnect;
    end;
  end;
end;

  with AThread.Connection do
  begin
    WriteLn('Hello from Basic Indy Server server.');
    Listbox1.Items.Add(ReadLn);

    WriteLn('hello again, said the server.');
    Listbox1.Items.Add(ReadLn);
    
    Disconnect;
   end;					

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Server.OnExecute := ServerExecute;//du kannst natürlich anderen Namen geben

{...}

procedure TForm1.ServerExecute(AThread: TIdPeerThread);
begin
  {...}
end;