An enumerator exposes the ISourcesRowset interface, which returns a rowset describing all data sources and enumerators visible to the enumerator. A root enumerator, shipped in the Microsoft Access Software Development Kit (SDK), traverses the registry looking for data sources and other enumerators. Other enumerators traverse the registry or search in a provider-specific manner. For example, an enumerator over the file system might search for subdirectories.