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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, IdBaseComponent, IdComponent, IdTCPConnection,
  IdTCPClient;

type
  TForm1 = class(TForm)
    TCPClient: TIdTCPClient;
    Button1: TButton;
    Chatlog: TListBox;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);

  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin

with TCPClient do begin
//Host:= Edit1.Text;
//Port:= 666;
Connect;
try
Chatlog.Items.Add(TCPClient.ReadLn);
finally
Disconnect;
end;
end;
end;

end.                    

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unit Unit1; 

interface 

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, 
  Dialogs, IdBaseComponent, IdComponent, IdTCPServer; 

type
  TForm1 = class(TForm)
    TCPServer1: TIdTCPServer;
    procedure FormCreate(Sender: TObject);
    //procedure TCPServer1Connect(AThread: TIdPeerThread);
   procedure TCPServer1Execute(AThread: TIdPeerThread);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen } 
  end;

var 
  Form1: TForm1;

implementation

{$R *.dfm}

//procedure TForm1.TCPServer1Connect(AThread: TIdPeerThread);
//begin
//AThread.Connection.WriteLn('Welcome to the Indy TCP basic client/server demo');
//end;

procedure TForm1.TCPServer1Execute(AThread: TIdPeerThread);
begin
//AThread.Connection.Server.DefaultPort:=666;
with AThread.Connection do

  begin
  WriteLn('Hello from Basic Indy Server server.');
  Disconnect;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
TCPServer1.Active := True;
end;

end.