Set InternetDomainName for users

[judge4life]

Hello,

I've posted this question in other threads, but I am not sure if anyone saw
it. Anyway, I will try once again. I looked inside the gwadapi2.h header
file, and I found that there are 3
IADUser interfaces (IADUser, IADUser2, IADUser3). Inside the IADUser3
interface there are 2 functions declared:

STDMETHOD(get_InternetDomainName)(THIS_ BSTR FAR* retval) PURE;
STDMETHOD(SetInternetDomainName)(THIS_ BSTR bstrIDomName, VARIANT_BOOL
bIDomExclusive) PURE;

Inside IADUser2 there are:
STDMETHOD(get_PrefEMailID)(THIS_ BSTR FAR* retval) PURE;
STDMETHOD(put_PrefEMailID)(THIS_ BSTR bstrPrefMailID) PURE;

Has anyone managed to use this functions? I tried calling them from C++ and
I didn't succed.

Thank you for your time,
Ionut Marin.