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handshaking
Also known as flow control, handshaking is a method of regulating the flow of data between two modems and between
modem and computer or between a computer and a printer This ensures that neither device has to wait for too long for data
nor gets swamped by too much information at once.
hard disk
A hard disk is a device which usually resides inside a computer for the semi permanent storage of data. It holds data after the
computer has been switched off, unlike RAM which looses data when the machine is powered down. Data on the hard disk
may be changed by the user. Storage capacity is measured in megabytes.
hardware
All the physical components of a computer and its accessories.
Hayes AT command set
A set of commands devised by modem manufacturer Hayes that have become the de facto standard for software which
controls modems. A modem which is Hayes-compatible can be connected to any computer and controlled by issuing these
commands using any terminal communications software.
helper application
An Internet application needed by a client to provide functionality not contained within the client, such as the ability to play a
sound file or act as a Telnet client.
hertz
The metric measurement of frequency, other uses to measure the speed of a microprocessor or the bandwidth of a
communication system. One hertz is equivalent to one cycle per second.
home page
The default hypertext page which appears when you electronically visit a part of an Internet site. The GarfNet Home page can
be found on http://www.garfnet.org.uk
host
Refers to a computer on a network that provides services to many users. Dial-up users connect to the Internet via a host
computer maintained by their service provider. Host computers often run server software with which users interact by means
of a client.
HTML
Hypertext Markup Language
HTTP
Hypertext Transport Protocol.
hypertext
A document containing links to other documents. The reader is not forced to read a hypertext document from beginning to
end, but can freely follow any one of several marked links to linked documents, which could physically reside almost
anywhere on the planet. Hypermedia, a superset of hypertext, implies other media such as graphics, sounds, and animations
can be played by clicking on a link. The WWW uses the metaphor of a hypertext page.
Hypertext Markup Language (HTML)
A format used by the WWW to build hypertext documents. It consists of a text document with instructions embedded in tags.
For example in the text: This is a <B><I>test</I></B> message the word test would appear in bold italics.
Hypertext Transport Protocol (HTTP)
Used by the WWW to form hypertext links.