<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>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.
