Computer World. Матросова Т.А. - 20 стр.

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19
Unlike the regular mail, E-mail often reaches its destination, even on other
continents, in minutes or less unless some part of the network is heavily congested or
temporarily out of order. When your daughter inspects her electronic mailbox, she
will discover your E-mail. The speed of E-mail and the ease with which it can be sent
even to multiple recipients all over the world make it a popular form of
communication.
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Another popular service is called Usenet. Usenet offers access to newsgroups for
group discussions on specific topics. Some newsgroups focus on buying or selling
various consumer items. There are thousands of newsgroups, and once a user has
gained access to Usenet, there is no cost to subscribe to them.
Let’s imagine that someone has joined a newsgroup involved in stamp
collecting. As new messages about this hobby are sent by others subscribing to this
group, the messages become available to this newcomer. This person reviews not
only what someone has sent to the newsgroup but also what others have written in
response. If, for example, someone requests information about a particular stamp
series, shortly afterward there may be many responses from around the world,
offering information that would be immediately available to all who subscribe to this
newsgroup.
A var iation of this idea is the Bulletin Board System (BBS). BBSs are similar to
Usenet, except that all files are located on a single computer, usually maintained by
one person or group. The content of news-groups reflects the varied interests,
viewpoints, and moral values of those who use them, so discretion is needed.
File Sharing and Topic Searching
One of the original Internet goals was global information sharing. The teacher
mentioned in the previous article located another educator on the Internet who was
willing to share already developed course materials. Within minutes the files were
transferred, despite a 2,000-mile distance.
What help is available when one does not know where a subject may be located
within the Internet? Just as we locate a phone number by using a telephone directory,
a user may find locations of interest on the Internet by first gaining access to what are
known as search sites. The user supplies a word or a phrase, the site then replies with
a list of Internet locations where information can be found. Generally, the search is
free and takes only a few seconds.
The farmer mentioned earlier had heard of a new technique called precision
farming, which uses computers and satellite maps. By enter ing that phrase at a search
site, he found the names of farmers who were using it as well as detailed information
about the method.
The World Wide Web
The part of the Internet called World Wide Web (or Web) allows authors to use
an old-fashioned idea that of footnotes in a new way. When an author of a magazine

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