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type
TForm1 = class(TForm)
//...
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    
 
  private
    { Private-Deklarationen }
    procedure WmHotkey(var Msg: TMessage); message WM_HOTKEY;

procedure TForm1.FormCreate(Sender: TObject);
begin
RegisterHotKey(Handle, 1,MOD_SHIFT or MOD_ALT, Ord('H'))
end;

procedure TForm1.WmHotkey(var Msg: TMessage);
begin
  if (Msg.WParam = 1) then
  begin
  HIDE;
  end;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  UnregisterHotKey(Handle,1);
end;					

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
    { Private-Deklarationen }
    procedure HK(var Msg:TMessage); message WM_HOTKEY;
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  RegisterHotKey(Handle, 1, MOD_SHIFT or MOD_ALT, Ord('H'))
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  UnRegisterHotKey(Handle, 1);
end;

procedure TForm1.HK(var Msg:TMessage);
begin
  if Msg.wParam = 1 then ShowMessage('Hotkey');
end;

end.