Nortel 1001t, Installation Manual, Page: 102 / 124

Glossary-8
Standard 1.0 Nortel Symposium Call Center Server May 1998
1001t Hardware Installation Guide
devices and memory). This process enables the microprocessor
to spend its time performing other functions.
directory number
The number that identifies a phoneset on a PBX or in the public
network. The directory number could be a local PBX extension
(local DN), a public network telephone number, or an automatic
call distribution directory number (ACD-DN)—the pilot or
group number for an ACD queue.
Disk Operating System
Originally developed by Microsoft, DOS is the standard, IBM-
compatible, 16-bit operating system. New operating systems
(including Windows 95) do not rely on DOS.
display
The device you look at when you work with a computer, for
example a CRT monitor (in desktop systems) or a Liquid crystal
display (in notebooks).
DMA
See direct memory access.
DN
See directory number.
DNIS
See Dialed Number Identification Service.
DOS
See Disk Operating System.
driver
A program that controls a device. Every device, whether it is a
printer, disk drive, or keyboard, must have a driver program. A