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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    IdTCPServer1: TIdTCPServer;
    procedure FormDestroy(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
  Log: TMemo;
implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
    IdTCPServer1.DefaultPort :=  12345;
    IdTCPServer1.Active := true;
    Log.lines.add('Server online!');
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
    IdTCPServer1.Active:= false;
end;

end.