Washington: The National Security Agency (NSA) has released a guide to ''help you understand how to use the Internet more efficiently''.
The guide to ''Internet Research'' is a ''how-to'' book for its agents looking to get the most out of Google, Yahoo and other Web search tools.
The guidebook, which was stamped ''For Official Use Only'' offers a number of tips for the spy in training.
According to Fox News, the guidebook also offers suggestions on how to find spreadsheets full of passwords in Russia: Type "filetype:xls site:ru login.
The 643-page tome, called Untangling the Web: A Guide to Internet Research, was last updated in 2007, so the search engine advice it offers is often outdated.