delphi global cursor position

Hi,
I'm trying to understand the code below (which I found on the web).

Its quite simple - a small stayontop form with a Tapplicationevents component and one label.
It works OK but the global  mouse position is constantly being refreshed. I've tried to select only mouse messages to reduce the flickering caused by the the vast number of messages/sec, but the app stops working. If the mouse is stationary, the position is still refreshed. Is there anything I can do about this.
Thanks


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, AppEvnts, ExtCtrls;

type
  TForm1 = class(TForm)
    Label1: TLabel;
    ApplicationEvents1: TApplicationEvents;
    procedure ApplicationEvents1Idle(Sender: TObject; var Done: Boolean);
    procedure ApplicationEvents1Message(var Msg: tagMSG;
      var Handled: Boolean);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
   
implementation

{$R *.dfm}


procedure TForm1.ApplicationEvents1Idle(Sender: TObject;
  var Done: Boolean);

var
Msg: tagMSG;
Begin
label1.Caption := ' X-' + inttostr(Msg.pt.X) + ' Y-'+ inttostr(Msg.pt.Y);
end;


procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG; var Handled: Boolean);
begin
label1.Caption := ' X-' + inttostr(Msg.pt.X) + ' Y-'+ inttostr(Msg.pt.Y);
end;
end.