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NetPlex/!Netplex/!Help/HTML/a1-gloss

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

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<HTML>

<HEAD>
<TITLE>Netplex - Glossary</TITLE>
</HEAD>

<BODY TEXT="#000000" BGCOLOR="#ffffff" LINK="#004499" VLINK="#00224c" ALINK="#00cc00">

<H1><IMG SRC="images/world" ALIGN=ABSMIDDLE>  Glossary</H1>
<HR>

<DL>
<DT>Browser
<DD>A Client which renders entities available from a server in a form consistent with open standards.

<DT>CGI
<DD>Common Gateway Interface - a semi-standard method allowing HTTP servers to execute and return the results of programs.  Netplex uses a modified version of CGI, better suited to RISC OS.

<DT>Client
<DD>A program that establishes connections for the purpose of sending requests.  Typically, in this context, a World-Wide Web Browser.

<DT>Client Authentication
<DD>A standard password method supported by most HTTP clients and servers.  It only allows access to certain Resources if valid Credentials are supplied.

<DT>Connection
<DD>A transport layer virtual circuit established between two programs for the purpose of communication.

<DT>Credentials
<DD>The username and password, as passed to the server during Client Authentication.

<DT>DELETE
<DD>A type of request from a Client, sent to a Server, asking that the named Resource be removed from the Server's databases.

<DT>Entity
<DD>A particular representation or rendition of a data Resource, or reply from a service Resource, that may be enclosed within a Request or Response message.  An Entity consists of metainformation in the form of Entity headers and content in the form of an Entity body.

<DT>Form
<DD>An HTML extension which allows the client to send data to a CGI program on the server.  Forms are used to collect data, for example, if you are asked to fill out a comments form on a web page.

<DT>GET
<DD>A type of request from a Client, sent to a Server, asking that the specified Resource be retrieved.  Parameters are passed to CGI programs via the URL, prefixed by a '?'.

<DT>Imagemap
<DD>An embedded graphic which when clicked upon redirects the client to another Resource.

<DT>Message
<DD>The basic unit of HTTP communication, consisting of a structured header and, optionally, an Entity.  It is transmitted via the connection.

<DT>POST
<DD>A type of Request from a Client, sent to a Server, asking that the specified Resource be retrieved once the enclosed parameters have been passed to it.  Parameters are passed in an attached Entity.

<DT>Proxy
<DD>An intermediary program which acts as both a Server and a Client for the purpose of making Requests on behalf of other Clients.  Requests are serviced internally or by passing them onto other Servers.

<DT>PUT
<DD>A type of request from a Client, sent to a Server, which sends an Entity to the recipient and asks that it be stored under the named Resource.

<DT>Realm
<DD>A section of a server's Resource database, protected using Client Authentication.

<DT>Request
<DD>A message from from a Client, sent to a Server, invoking an action.

<DT>Response
<DD>A message from a Server, sent to a Client, sending a Resource.

<DT>Resource
<DD>An object or service which can be identified by a URL.

<DT>Server
<DD>A program that accepts connections in order to service requests by sending back Responses.

<DT>URL
<DD>Uniform Resource Locator - a network address and file path indicating the location of a Resource.

<DT>User Agent
<DD>The Client which initiates a Request.  These are often browsers, editors, spiders (web-traversing robots), or other end-user tools.

<DT>WWW
<DD>Abbreviation for World-Wide Web.

</DL>

<HR>

<P><CENTER>
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