You might see that API referred here and there to help with the new UAC scenarios. And you'll also read that some people are wondering where the API declaration is...

I understand that the COM team implemented Elevation Moniker to super-set this API functionality: The COM Elevation Moniker. From that page:

HRESULT CoCreateInstanceAsAdmin(HWND hwnd, REFCLSID rclsid, REFIID riid, void ** ppv) {
    BIND_OPTS3 bo;
    WCHAR  wszCLSID[50];
    WCHAR  wszMonikerName[300];

    StringFromGUID2(rclsid, wszCLSID, sizeof(wszCLSID)/sizeof(wszCLSID[0])); 
    HRESULT hr = StringCchPrintf(wszMonikerName, 
sizeof(wszMonikerName)/sizeof(wszMonikerName[0]),
L"Elevation:Administrator!new:%s",
wszCLSID); if (FAILED(hr)) return hr; memset(&bo, 0, sizeof(bo)); bo.cbStruct = sizeof(bo); bo.hwnd = hwnd; bo.dwClassContext = CLSCTX_LOCAL_SERVER; return CoGetObject(wszMonikerName, &bo, riid, ppv); }

Auf wiedersehen!