User's Manual

Glossary 189
HPFS
Abbreviation for the High Performance File System option
in the Windows NT and later Windows operating systems.
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 Interface-Causing Equipment
Standard (in Canada).
ICU
Abbreviation for ISA Configuration Utility.
IDE
Abbreviation for Integrated Device Electronics. IDE is
a computer system interface, used primarily for hard
drives and CDs.
I/O
Abbreviation for input/output. The keyboard is an
input device, and a printer is an output device. In
general, I/O activity can be differentiated from
computational activity. For example, when a program
sends a document to the printer, it is engaging in
output activity; when the program sorts a list of terms,
it is engaging in computational activity.
ID
Abbreviation for identification.
IHV
Acronym for independent hardware vendor. IHVs often
develop their own MIBs for components that
they manufacture.
interlacing
A technique for increasing video resolution by only
updating alternate horizontal lines on the screen.
Because interlacing can result in noticeable screen
flicker, most users prefer noninterlaced video adapter
resolutions.
internal microprocessor cache
An instruction and data cache built in to the
microprocessor. The Intel Pentium microprocessor
includes a 16-KB internal cache, which is set up as an
8-KB read-only instruction cache and an 8-KB
read/write data cache.
IP
The Internet Protocol (IP) is the method or protocol
by which data is sent from one computer to another on
the Internet. Each computer (known as a host) on the
Internet has at least one IP address that uniquely
identifies it from all other computers on the Internet.
IPMI
Abbreviation for Intelligent Platform Management
Interface, which is an industry standard for
management of peripherals used in enterprise
computers based on Intel architecture. The key
characteristic of IPMI is that inventory, monitoring,
logging, and recovery control functions are available
independent of the main processors, BIOS, and
operating system.
IPX
Acronym for internetwork packet exchange.
IRQ
Abbreviation for interrupt request. A signal that data
is about to be sent to or received by a peripheral device
travels by an IRQ line to the microprocessor. Each
peripheral connection must be assigned an IRQ
number. For example, the first serial port in your
computer (COM1) is assigned to IRQ4 by default. Two
devices can share the same IRQ assignment, but you
cannot operate both devices simultaneously.