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  TTestThread = class(TThread)
    constructor create;
    procedure Execute; override;
  end;

var Form1: TForm1;

threadvar Test : Integer;

implementation

{$R *.dfm}

{ TTestThread }

constructor TTestThread.create;
begin
  inherited;
  Test := 12;
  ShowMessage('Create ' + IntToStr(Test));
end;

procedure TTestThread.Execute;
begin
  inherited;
  ShowMessage('Execute ' + IntToStr(Test));
end;

procedure TForm1.btn1Click(Sender: TObject);
var TestThread : TTestThread;
begin
  TestThread := TTestThread.create;
end;