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procedure TForm1.ApplicationEvents1Message(var Msg: tagMSG;
  var Handled: Boolean);
begin
  if Msg.message = WM_MOUSEWHEEL then
  begin
    wheel := HIWORD(Msg.wParam);

    if wheel<32768 then
      light_z := light_z + 30
    else if wheel>32767 then
      light_z := light_z - 30;
    Form1.caption := 'light z=' + format('%f', [light_z]) + ', mode=' +inttostr(mode) ;
  end;

  {if  msg.message = WM_KEYDOWN then
  begin
    if msg.wParam = vk_return then
       showmessage('halllllloo');
  end;
  }

end;					

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procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  if key=vk_RETURN then
  begin

     showmessage('Hallo');

    // //inc(mode);
    // if mode=4 then mode:=0;
  end;
end;					

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SendMessage(Form1, WM_KEYDOWN, Key, 0);