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type
  TForm1 = class(TForm)
    {...}
  protected
    procedure CreateParams(var Params: TCreateParams); override;

procedure TForm1.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  if Assigned(Application.MainForm) then
  begin
    Params.WndParent := GetDesktopWindow;
    Params.Style := WS_CHILD;
  end;
end;					

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procedure TMainForm.ApplicationEvents1Activate(Sender: TObject);
begin
 SetWindowPos(Handle, HWND_BOTTOM, Left, Top, Width, Height, 0);
end;