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//die sehr kurze DLL

function GKeyBoardHook(code: integer; wParam: word; lParam: longword): longword;stdcall;
begin
sysutils.beep;
ShowMessage('beep!');
end;					

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//das Programm

Form1: TForm1;
  LibHandle: HInst;
  KBHook: HHook;
  HookProc: pointer;  //memory address of hook procedure in windows
...

procedure TForm1.Button1Click(Sender: TObject);    //Button zum installieren der Hooks
begin
//Handle for current Hook
KBHook:=SetWindowsHookEx(WH_KEYBOARD,HookProc,LibHandle,0);
end;


procedure TForm1.FormCreate(Sender: TObject);
begin
//DLL mit Hook Procedure wird geladen
LibHandle := LoadLibrary('GHookDLL.dll');
if LibHandle = 0 then ShowMessage('Konnte DLL nich laden'); //tritt nicht auf
//Handle der Hook Procedure finden
HookProc:=GetProcAddress(LibHandle,'GKeyBoardHook');
if HookProc = nil then ShowMessage('Addresse nicht gefunden');//Fehler tritt auf
end;
//Button zum deinstalieren des HOoks
procedure TForm1.Button2Click(Sender: TObject);
begin
UnhookWindowsHookEx(KBHook);
end;					

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  exports
    GKeyBoardHook;					

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if wParam = WM_KEYDOWN then // oder UP oder sonst was
...					

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