Computer World. Матросова Т.А. - 84 стр.

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Client, Server, and Support Software. A large collection of software can be
used in the development, maintenance, and daily activity of a Web-based classroom.
One way of categorizing the software is to use the following three categories:
Support. Software in this category generally has little or no direct
connection with the Web. Instead, it is software the participants use to support
their activity within the Web-based classroom. Some examples include word
processors, graphics programs, and databases.
Client. Students and educators participating in a Web-based classroom do
so via a computer and a collection of client software. The client software
provides the interface to the Web-based classroom that the participants use to
perform tasks and interact in the Web-based classroom. Examples of client
software include Web browsers such as Netscape, e-mail programs such as
Eudora, and programs that provide access to other Internet services such as
chats, MUDs, and videoconferencing.
Server. The client software provides the interfaces the participants use, but
it does not provide a method for supplying the management and distribution of
information required to allow a group of people to communicate and share
information. Management and distribution of information in a Web-based
classroom are the responsibility of the server software. Each of the major
services provided by a Web-based classroom – a Web server, e-mail, mailing
lists, interactive chats, and MUDs – all require a specific server.
Typically, the Web-based classroom participants' computers will provide the
support and client software, while the server software will reside on one or two
central computers. However, this is not always true. It is common for a Web-based
classroom's developers to use one computer for development and to move to a server
on a central computer when finished. During the development stage, the developer's
computer can contain all of the necessary support, client, and server software.
Connections. For a Web-based classroom to work, there must be a connection
between the client and server software (for example, between a student's browser and
the class Web server). Some variation in the types of connections is possible. The
following list breaks the possible connections into four broad categories:
LAN and faster. Most university campuses and businesses have some
form of local area network (LAN). These connections are among the fastest and
most expensive to set up.
Home connections. For most users today, connecting from home means
using a modem and a phone line. Although fast enough for most purposes, a
modem can be quite slow for the retrieval of large documents or multimedia files
(videos and sound clips, for instance). In some parts of the world, ISDN and
cable modems are available: these are approaching the speed of some LANs.
Although less expensive, these connections are usually paid for by students. In
some countries, fees for these connections can be charged on the basis of how
long the user is connected.

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