[NumLock]

Код:

unit Unit1;

interface

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

type
  MyThread = class(TThread)
  private
    str: String;
    procedure Updt;
  protected
    procedure Execute; override;
  end;

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

var
  Form1: TForm1;

implementation

{$R *.dfm}

{ MyThread }

procedure MyThread.Execute;
begin
  Synchronize(Updt);
end;

procedure MyThread.Updt;
begin
  Form1.Memo1.Lines.Add(str);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
begin
  for i:=0 to 6 do
    with MyThread.Create(True) do
      begin
        str:='Aaa'+IntToStr(i);
        Resume;
        Sleep(1);
      end;
end;

end.