unit Unit3;

interface

uses
  Classes;

type
  TnewThread = class(TThread)
  private
    { Private declarations }
  protected
    procedure Execute; override;
  end;

implementation

{ Important: Methods and properties of objects in visual components can only be
  used in a method called using Synchronize, for example,

      Synchronize(UpdateCaption);

  and UpdateCaption could look like,

    procedure TnewThread.UpdateCaption;
    begin
      Form1.Caption := 'Updated in a thread';
    end; }

{ TnewThread }

procedure TnewThread.Execute;
begin
while true do;
end;
procedure TForm1.Button1Click(Sender: TObject);
var
  NewThread: TNewThread;
begin
  NewThread:=TNewThread.Create(true);
  NewThread.FreeOnTerminate:=true;
  NewThread.Priority:=tpLower;
  NewThread.Resume;
end;

end.