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Search Engines and Directories
(does not list all)
Boolean Search Logic  |  How Search Engines Work
Alta Vista AltaVista recognizes capitalization, names and titles. Can search by date, filetype, location.... Questions help narrow search.  Simultaneously searches other sites. Interprets natural language
Bing Microsoft search engine with phone apps
Direct Hit
Ranks a site based on the number of same subject pages that reference it, not just general popularity. Does not support boolean searches. 
Dogpile searches search engines, Web directories / servers dedicated to indexing Internet Web pages, pay-for-placement: engines that return sponsored listings, and engines or databases that are meta-searched specifically for images,  products, audio/MP3 and multimedia files, news, FTP files and message boards
All the Web
claims it indexes "billions of web pages, hundreds of millions of multimedia, Audio
and FTP files, as well as tens of millions of PDF and MS Word® and scans the entire web every 7 - 11 days. Supports searching in 49 different languages. 
Find How search "how-to" categories and subject areas.
 search by language, file format, date, occurrences, domain name, page specific, topic specific and allows you to do a "safe search."
Look Smart Explore by topics, global directories. Find articles feature.
Metacrawler results include commercial (sponsored) and
non-commercial results. Designed to identify the intent of a user's search. "If the search term (i.e. buy roses) is determined to be commercial in-nature, a blended mix of results weighted towards sponsored results would be displayed. "
Not a search engine. It is a directory of subject categories, reference site-of-the day,  facts-at-a-glance, facts encyclopedia, reference resources, alphabetized subject categories, current news and weather, links to google for searches.
" sends your search query to several search engines at one time and integrates the results into one list"
Yahoo searches theWeb for news, images, directories, yellow pages, and prpoduct review searches. 
Boolean operators are used to search many databases, incl. libraries, 
not only Web-based indexes/directories.
Finds only documents containing all of the specified words or phrases. "Computers AND viruses" finds documents with both the word computers and the word viruses.
Finds documents containing at least one of the specified words or phrases. "Computers OR viruses" finds documents containing either computers or viruses.  The documents found could contain both, but do not have to.
Finds documents containing both specified words or phrases positioned a certain number of words apart (assigned by the search engine). 
Finds only documents which exclude the term after the word "NOT." "Computers NOT viruses" finds documents with the word "computers" but not the word "viruses."
Terms preceeded with "+" indicate they have priority in the search.
" "
Phrases between quotation marks are search exactly as they are written. 
This symbol is used for Wildcard searching. For example, comput* will search Computer, computing, etc.
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