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Appendix F. Glossary
61203153L2-20 Express 3000 User Manual F-3
graphical user interface (GUI)
A computer interface that permits users to directly manipulate ob-
jects which are displayed on the monitor. Using pointing devices
(such as a mouse), the screen objects can be modified and con-
trolled.
Integrated Services Digital Network (ISDN)
An international communications standard for digital transmis-
sion of data, voice, and video over telephone lines.
Internet Services Provider (ISP)
A company or organization that provides Internet access to the
public or to other organizations, usually for a fee. Most offer a full
set of Internet services (access to E-Mail, Newsgroups, FTP, and
Telnet, at a minimum), and provide either hourly rates or a flat fee
for a fixed number of hours of access.
interrupt request (IRQ)
A system of implementing computer processor interrupts (a sus-
pension of one process to initiate another process--usually tempo-
rarily).
Local Directory Number
The seven digit telephone number assigned to the ISDN line.
Load Number (LN)
The Canadian equivalent to the U.S. Ringer Equivalence Number
(REN) system (see also, Ringer Equivalence Number).
plain old telephone service (POTS)
The basic analog phone service. Does not include ISDN or calling
features such as caller ID, etc.
Point-to-Point Protocol (PPP)
A standard method of transporting multiprotocol datagrams over
point-to-point links. PPP facilitates connections through a wide
variety of hosts, bridges, and routers. PPP is intended for simple,
bidirectional, full duplex links transporting packets between
peers.