我需要系统范围内的快捷键，如何才能做到呢？

type
TForm1 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
protected
procedure hotykey(var msg:TMessage); message WM_HOTKEY;
end;

var
Form1: TForm1;
id,id2:Integer;

implementation

{$R *.DFM}


procedure TForm1.hotykey(var msg:TMessage);
begin
if (msg.LParamLo=MOD_CONTROL) and (msg.LParamHi=81) then
begin
ShowMessage('Ctrl + Q ');
end;

if (msg.LParamLo=MOD_CONTROL) and (msg.LParamHi=82) then
begin
ShowMessage('Ctrl + R ');
end;
end;


procedure TForm1.FormCreate(Sender: TObject);
begin
id:=GlobalAddAtom('hotkey');
RegisterHotKey(handle,id,mod_control,81);

id2:=GlobalAddAtom('hotkey2');
RegisterHotKey(handle,id2,mod_control,82);
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
UnRegisterHotKey(handle,id);
UnRegisterHotKey(handle,id2);
end;