Computer Glossary H
Hayes command set Set of instructions for controlling basic
modem functions, such as dialling and hanging up, devised by
the modem manufacturer Hayes. You probably won’t have to
know anything about them; your comms program will let you
select a plain-English option like ‘dial now’ and will then
translate that into the relevant Hayes command code for you.
HSCSD high-speed circuit-switched data. HSCSD allows wireless
data to be sent at a rate of 38.4Kbps (kilobits per second) or
more, as opposed to a current GSM speed of 9.6Kbps. This is comparable to the transmission rates of usual modems via fixed telephone networks today.
HTML hypertext markup language. HTML is the set of markup
symbols or codes inserted in a file intended for display on a
web browser page. The markup tells the web browser how to
display a web page’s words and images for the user. Each
individual markup code is referred to as an element (but many
people also refer to it as a tag). Some elements come in pairs
that indicate when some display effect is to begin and when
it is to end.
HTTP hypertext transfer protocol. The communications protocol
for the web. HTTP defines how information is transmitted across
the internet.
Hub A device used on a star network to connect all PCs
together. When it receives a signal it refreshes and
strengthens it before passing it on.
Hypertext Method of presenting information so users can jump
around a document by clicking on a highlighted word or an icon,
rather than being forced to navigate it in a linear fashion.
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