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  public
    procedure AppActivate(Sender: TObject);
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Application.OnActivate := AppActivate;
end;

procedure TForm1.AppActivate(Sender: TObject);
begin
  showmessage('aktiviert');
end;