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Glossary-8
Standard 1.0
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
Nortel Symposium Call Center Server
1001t Hardware Installation Guide
May 1998
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