关于SCOPE的用法

SELECT *
FROM OPENQUERY(FileSystem,
'SELECT DocAuthor, DocTitle, DocSubject, FileName
FROM SCOPE('' "/corpus" '',
'' "C:\temp" '' )
WHERE DocWordCount >= 5000 AND
( DocAuthor = ''Wendy Vasse'' OR
DocAuthor = ''Anas Abar'' )
ORDER BY DocPageCount DESC ' )

请各位高人帮我分析分析SCOPE的用法，我看了bookonline，还是一头雾水，谢谢!