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var hEve : THandle;
begin
   hEve := CreateEvent(nil,False,False,'TEST');
  ...
...
...
...
   WaitForSingleObject(hEve,INFINTE);					

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while WaitForSingelObject(hEve, 100) = WAIT_TIMEOUT do
  Application.ProcessMessages;					

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type
  TMyThread = class(TThread)
  protected
    procedure Execute; override;
  end;

function MyThread(Param: Pointer): Integer;
var hEve : THandle;
begin
  hEve := CreateEvent(nil,False,False,'TEST');
  WaitForSingleObject(hEve, INFINITE);
  ShowMessage('Hallo');
  Result := 0;
end;

procedure TMyThread.Execute;
begin
  MyThread(0);
end;

procedure TForm1.Button1Click(Sender: TObject);
var ThreadId: THandle;
begin
//  BeginThread(nil, 0, MyThread, nil, 0, ThreadId);
  with TMyThread.Create(False) do
    FreeOnTerminate := True;
end;