http://msdn.microsoft.com/en-us/library/dd317976(VS.85).aspx
STDAPI AccessibleObjectFromEvent(
__in HWND hwnd,
__in DWORD dwObjectID,
__in DWORD dwChildID,
__out IAccessible **ppacc,
__out VARIANT *pvarChild
);
What is IAccessible** equivalent in Delphi (2009)?