Allows searches to be constrained to particular subsets of information, such as web pages or Usenet news articles. Deja News Searches newsgroups on the Internet. Allows for precision searching, using boolean operators, keyword symbols and context operators, and query filtering. Excite Offers concept search capabilities by matching words with ideas that are closely related to them. Results are displayed 10 at a time, in decreasing order of confidence.
Links results to additional sites of interest.
FastSearch Single database of indexed Web pages. Displays documents that contain all of the words specified in the search. Very large database, but many duplicate records are retrieved in searching. Google Uses phrase searching and relevance ranking based on link analysis of each site. Checks for dead links.