[NumLock]

Код:

unit Unit1;

interface

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

type
  TMyBeep = procedure(dwFreq, dwDuration: DWORD);

  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure MyBeep(dwFreq, dwDuration: DWORD);
begin
  Windows.Beep(dwFreq, dwDuration);
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  p: TMyBeep;
begin
  @p:=@Unit1.MyBeep;
  p(1000, 100);
end;

end.