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const
  cWM_MYTRAYICONCALLBACK = WM_USER + 1000;                    

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  public
    fIconData: TNotifyIconData;
    procedure TaskTrayWndProc (var Msg: TMessage); message cWM_MYTRAYICONCALLBACK;
  end;

var
  Form1: TForm1;
  fwm_TaskbarRestart:cardinal;                    

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procedure TForm1.TaskTrayWndProc (var Msg: TMessage);
begin
  case Msg.LParam of
    WM_LBUTTONDOWN: Begin if form2.Visible=false then form2.Show
                                                 else form2.close;
                    end;
    WM_RBUTTONDOWN: pop_rechts.Popup(mouse.CursorPos.X, mouse.CursorPos.y);
    end;
  If (fwm_TaskbarRestart<>0) and (Msg.Msg=fwm_TaskbarRestart) Then
    Begin
      with fIconData do
       begin
           cbSize := SizeOf (TNOTIFYICONDATA);
           Wnd := Handle;
           uID := 5;
           uFlags := NIF_MESSAGE + NIF_ICON + NIF_TIP;
           hIcon := image1.Picture.Icon.Handle;
           szTip := 'Programm öffnen';
           uCallBackMessage := cWM_MYTRAYICONCALLBACK;
        end;
      If not Shell_NotifyIcon (NIM_ADD, @fIconData) then
        { Fehler! };
    End;
     Inherited;
end;