How does my form detect KeyDown events when another control has focus?

procedure TMainForm.KeyDown(Sender: TObject; var Key: Word; Shift: TShiftState);
begin
  if (GetKeyState(Ord('Q'))<0) and (GetKeyState(Ord('W'))<0) and (GetKeyState(Ord('E'))<0)
  then ShowMessage('You pressed it');
end;

      

        
        
        
      

    

the above event only works if the focus is on the main form. if i launch the app and keep pressing Tab and change Focus to any form element, will it disable this event until we focus again on the main form?

Question: How can I detect that three keys are pressed even if the focus is not on the main form?

Also I thought that if I use RegisterHotKey but it is not recommended to register Q, W and E while my application is running.

procedure TMainForm.WMHotKey(var Msg: TWMHotKey);
begin
  if ActiveCaption = 'my Form Caption' then
  Begin
    if Msg.HotKey = HotKey1 then
    begin
      //DoSomething;
    end
    else
    if Msg.HotKey = HotKey2 then
    begin
      //DoSomething;
    end;
  End
  else
   //DoSomething;
end;