unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,StdCtrls, ExtCtrls;


type
  TForm1 = class(TForm)
    Button1: TButton;
    Memo1: TMemo;
    Timer1: TTimer;
    procedure Button1Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

  TNewThread = class(TThread)
  private
  protected
    procedure Execute; override;
  public
    constructor Create(CreateSuspended: Boolean);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

constructor TNewThread.Create(CreateSuspended: Boolean);
begin
  inherited Create(CreateSuspended);
end;

procedure TNewThread.Execute;
var StrPage:string;
begin
Form1.Memo1.Tag :=  Form1.Memo1.Tag+1;
Form1.Memo1.Lines.Add(Inttostr(Form1.Memo1.tag));
end;


procedure TForm1.Timer1Timer(Sender: TObject);
begin
TNewThread.Create(false); //создаём поток
TNewThread.Create(false);
TNewThread.Create(false);
TNewThread.Create(false);
end;