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SEARCH ENGINES
Here
are just a few of the most useful, starting with old style information:
Directories (also known as Human-Indexed Search Engines): These
are a little like (and sometimes developed from) encyclopedias, cataloguing
information gathered and selected by humans (of varying levels of expertise)
e.g.
HYPERLINK http://www.britannica.com has the full text of the Encyclopedia
Britannica, for free;
HYPERLINK http://www.eb.com in addition (full service $5 per month)
reviews and rates over 130,000 sites.
Robot
(or Spider)-Indexed Search Engines: These are compiled automatically,
by software which regularly checks the Internet for sites and collects
the information.
HYPERLINK http://www.altavista.com It does ‘a big crawl’
of the Net every few months; ‘updating crawls’ bring in
millions of pages a day.
HYPERLINK http://www.nlsearch.com Northern Light helps to focus by organising
results in folders --- it will also sort results by date.
Meta-Search
Engines: These compile research from several engines into a
single set of results, but they can take a relatively long time. Most
select only a limited number of hits from each engine, so they do not
go as deep as a single engine Inference Find.
HYPERLINK http://www.infind.com searches WebCrawler, Yahoo, Lycos, AltaVista,
and Excite, merges and sorts the results, and removes duplicates; you
can set a maximum time for the search.
HYPERLINK http://www.dogpile.com searches 14 search engines, and you
can choose the order in which they are interrogated.
Newer Types: HYPERLINK http://www.google.com is a links
spider (now used on Yahoo) presenting results based on the importance
of the sites, calculated by the number of links to them from other sites.
It is very useful for finding the sites of companies and organisations
if you do not have the exact web address --- type in the name, hit the
"I’m feeling lucky" button, and it usually goes to the
right site.
HYPERLINK http://www.realnames.com uses a system of keywords to jump
straight to the right site. It is integrated into such engines as AltaVista,
Google and Inktomi.