Users Guide

Glossary 129
GUI
Acronym for graphical user interface.
h
Abbreviation for hexadecimal. A base-16 numbering
system, often used in programming to identify
addresses in the system's RAM and I/O memory
addresses for devices. The sequence of decimal
numbers from 0 through 16, for example, is expressed
in hexadecimal notation as: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A,
B, C, D, E, F, 10. In text, hexadecimal numbers are
often followed by h.
HBA
Abbreviation for host bus adapter. A PCI adapter card
that resides in the system whose only function is to
convert data commands from PCI-bus format to
storage interconnect format (examples: SCSI, Fibre
Channel) and communicate directly with hard drives,
tape drives, CD drives, or other storage devices.
heat sink
A metal plate with metal pegs or ribs that help dissipate
heat. Most microprocessors include a heat sink.
HMA
Abbreviation for high memory area. The first 64 KB of
extended memory above 1 MB. A memory manager
that conforms to the XMS can make the HMA a direct
extension of conventional memory. Also see XMM.
host adapter
A host adapter implements communication between
the system's bus and the controller for a peripheral
device. (hard drive controller subsystems include
integrated host adapter circuitry.) To add a SCSI
expansion bus to your system, you must install or
connect the appropriate host adapter.
hot plug
The ability to remove and replace a redundant part
while the system is still running. Also called a
"hot spare."
HPFS
Abbreviation for the High Performance File System
option in the Windows NT operating systems.
HTTP
Abbreviation for Hypertext Transfer Protocol. HTTP
is the client-server TCP/IP protocol used on the World
Wide Web for the exchange of HTML documents.
HTTPS
Abbreviation for HyperText Transmission Protocol,
Secure. HTTPS is a variant of HTTP used by Web
browsers for handling secure transactions. HTTPS is a
unique protocol that is simply SSL underneath HTTP.
You need to use "https://" for HTTP URLs with SSL,
whereas you continue to use "http://" for HTTP URLs
without SSL.
Hz
Abbreviation for hertz.
ICES
Abbreviation for Interference Causing Equipment
Standard (in Canada).
ICMP
Abbreviation for Internet Control Message Protocol.
ICMP is a TCP/IP protocol used to send error and
control messages.
ICU
Abbreviation for ISA Configuration Utility.
ID
Abbreviation for identification.
IDE
Abbreviation for Integrated Drive Electronics. IDE is
a computer system interface, used primarily for hard
drives and CDs.