Inherited CreateParams(Params);
  With Params do
    begin
                                  
     EXStyle:=ExStyle or WS_EX_TOPMOST OR WS_EX_ACCEPTFILES  or WS_EX_TOOLWINDOW ;
     wndParent:=GetDesktopWindow;  //关键一行,用SetParent都不行!!
   
     SetWindowLong(Application.Handle, GWL_EXSTYLE, WS_EX_TOOLWINDOW  );//这句是放在CREATE
   
    end;