[NumLock]

Код:

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unit Unit1;   interface   uses   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, StdCtrls;   type   TMyThread = class(TThread)   private     i: Integer;     procedure Updt;   protected     procedure Execute; override;   end;     TForm1 = class(TForm)     Label1: TLabel;     Button1: TButton;     procedure Button1Click(Sender: TObject);     procedure FormDestroy(Sender: TObject);   private     { Private declarations }     FMyThread: TMyThread;   public     { Public declarations }   end;   var   Form1: TForm1;   implementation   {$R *.dfm}   { TMyThread }   procedure TMyThread.Execute; begin   i:=0;   while not Terminated do   begin     Synchronize(Updt);     Inc(i);     if i>100 then Break;     Sleep(50);   end; end;   procedure TMyThread.Updt; begin   Form1.Label1.Caption:=IntToStr(i); end;   { TForm1 }   procedure TForm1.Button1Click(Sender: TObject); begin   FormDestroy(Sender);   FMyThread:=TMyThread.Create(True);   FMyThread.FreeOnTerminate:=False;   FMyThread.Resume; end;   procedure TForm1.FormDestroy(Sender: TObject); begin   if FMyThread<>nil then   begin     FMyThread.Terminate;     FMyThread.WaitFor;     FreeAndNil(FMyThread);   end; end;   end.

обработчики:
Button1.OnClick:=Button1Click;
OnDestroy:=FormDestroy;