    typedef struct IRpcHelperVtbl
    {
        BEGIN_INTERFACE

        HRESULT ( STDMETHODCALLTYPE *QueryInterface )(
            IRpcHelper * This,
            /* [in] */ REFIID riid,
            /* [iid_is][out] */ void **ppvObject);

        ULONG ( STDMETHODCALLTYPE *AddRef )(
            IRpcHelper * This);

        ULONG ( STDMETHODCALLTYPE *Release )(
            IRpcHelper * This);

        HRESULT ( STDMETHODCALLTYPE *GetDCOMProtocolVersion )(
            IRpcHelper * This,
            /* [out] */ DWORD *pComVersion);

        HRESULT ( STDMETHODCALLTYPE *GetIIDFromOBJREF )(
            IRpcHelper * This,
            /* [in] */ void *pObjRef,
            /* [out] */ IID **piid);

        END_INTERFACE
    } IRpcHelperVtbl;