unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private declarations }
      HotKeyID: Integer;
    procedure WMHotKey(var Msg: TWMHotKey); message WM_HOTKEY;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Wnd1,Wnd2 : array[0..255] of char;

implementation

{$R *.dfm}

procedure TForm1.WMHotKey(var Msg: TWMHotKey);
begin
  if Msg.HotKey = HotKeyID then
    ShowMessage('P wurde gedrückt !');
end;

procedure TForm1.FormCreate(Sender: TObject);
const
  VK_P = $50;
  VK_Not = $0;
begin
  HotKeyID := GlobalAddAtom(PChar(Application.Exename + '_Hotkey1'));
  RegisterHotKey(Handle, HotKeyID, VK_Not, VK_P);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  UnRegisterHotKey(Handle, HotKeyID);
  GlobalDeleteAtom(HotKeyID);
end;

end.