Users Guide

Glossary 129
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.
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.
IHV
Abbreviation 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 address
Abbreviation for Internet Protocol address. See
TCP/IP.