How to use AccessibleObjectFromWindow WinAPI function in Delphi?

http://开发者_运维知识库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)?

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function AccessibleObjectFromEvent(H : HWND; dwID, dwChildID : DWORD; out Acc : IAccessible; var varChild : Variant) : HRESULT; stdcall;