IServiceProvider- this is an imported (or possibly closed) COM interface intended for use in private objects in the context of the object that you request for the Service. Here the term "Service" is used rather poorly, initially it meant any COM object that could be returned based on which GUID is specified.
IServiceProvider @MSDN (.NET link)
IServiceProviderImpl @MSDN class (C ++ ATL link)
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WebBrowser ( 2) @MSDN