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D
Data Link Control (DLC)
: An
error-correction protocol in the Systems Network Architecture (SNA)
responsible for transmission of data between two nodes over a physical
link.
Daemon:
Pronounced "demon", a program that runs independently from the operating
system and handles routine processes in the background of network
transactions.www.tartoos.com
datagram :
A packet
of data and other delivery information that is routed through a
packet-switched network or transmitted on a local area network.
DDE :
Dynamic
Data Exchange. An interprocess communication method that allows two or
more programs running simultaneously to exchange data and commands.
DDI :
Device
driver interface.
DDK :Driver
development kit.
De facto
standard:
An e-learning specification that hasn't been officially
established by an accrediting agency but that is accepted and used as a
standard by a majority of practitioners.
default emulated LAN
: A
virtual network that acts like a
traditional LAN.www.tartoos.com
default gateway
: The
gateway used to connect to the rest of the network. See gateway.
Default: A setting that the computer system uses
automatically, unless it is changed by the user.
Delivery:
Any method of transferring content to learners, including
instructor-led training, Web-based training, CD-ROM, books, and more.
www.tartoos.com
demodulation :
Converting analog signals back into digital signals. A modem is a
MOdulator/DEModulator.
demand paging
:A method
by which code and data are moved in pages from physical memory to a
temporary paging file on disk.
device class driver
: In
Windows 98, a driver that provides an interface between different layers
of the WDM architecture.
designer:
A top-level software component
that includes a dedicated design environment. A visual designer object
controls the look and feel of a user interface at design time.
design-time object:An
object that is used at design time within a host’s development
environment. See also run-time object.
device node
: The
basic data structure for a given device, built by Configuration Manager;
sometimes called devnode. Device nodes are built into memory at system
startup for each device and enumerator with information about the device,
such as currently assigned resources. The complete representation of all
device nodes is referred to as the hardware tree.
Dynamic Host Configuration
Protocol (DHCP):An
industry-standard (TCP/IP) protocol that assigns Internet Protocol (IP)
configurations to computers. The DHCP-server computer makes
the assignments, and the
client computer calls
the server computer to obtain
the address.
Dial-Up Networking
:A
component of Windows NT and Windows 98 that makes it possible for users to
connect to remote networks such as the Internet or a private network.
digital ID
:An
electronic key, obtained from a certificate authority, that provides a
means for proving your identity on the Internet. Also called digital
certificate or authentication certificate.www.tartoos.com
DirectShow
:A
multimedia technology designed to play video, audio, and other multimedia
streams in a variety of formats that are stored locally or acquired from
Internet servers. DirectShow relies on a modular system of pluggable
components called filters arranged in a configuration called a filter
graph.
DirectX :
A
low-level API that provides user-mode media interfaces for games and other
high-performance multimedia applications. DirectX is a thin layer,
providing direct access to hardware services, and takes advantage of
available hardware accelerators and emulates accelerator services when
accelerators are not present.
Distributed Component Object
Model (Distributed COM) Additions to the Component Object Model (COM) that
facilitate the transparent distribution of objects over networks and over
the Internet.
distributed computing
:
Information processing in which computing tasks are divided into two
parts, one running on the client computer, the other on the server.
DIX:Digital/Intel/Xerox.
distribution media format
(DMF) :
A special read-only format for 3.5-inch floppy disks that permits storage
of 1.7 MB of data.
Desktop
videoconferencing:
Videoconferencing on a personal computer.
Development:
1) Learning or other types of activities that prepare a person for
additional job responsibilities and/or enable him to gain knowledge or
skills. 2) The creation of training materials or courses, as in content
development or e-learning development.
Dial up: To open a connection between a user's computer
and another computer via a modem.
Dial-up Networking:
Dial-up refers to a telephone connection (initiated by a modem) over a
network of shared lines. In this system, many users connect to one dial-up
server. These connections usually have a time limit. Dial-up networking
describes the vast majority of Internet connections. Connections in which a
specific line is established for one user are called dedicated network
connections.www.tartoos.com
Digital: An electrical signal that varies in discrete
steps in voltage, frequency, amplitude, locations, and so forth. Digital
signals can be transmitted faster and more accurately than analog signals.
Digital
Divide:
The gap that exists between those who can afford technology and those who
cannot.
Discussion
boards:
Forums on the Internet or an intranet where users
can post messages for others to read.
Distance
education: Educational situation in which the instructor
and students are separated by time, location, or both. Education or training
courses are delivered to remote locations via
synchronous or
asynchronous means of instruction,
including written correspondence, text, graphics, audio- and videotape,
CD-ROM, online learning, audio- and videoconferencing, interactive TV, and
FAX. Distance education does not preclude the use of the traditional
classroom. The definition of distance education is broader than and entails
the definition of e-learning.
Distance
learning: The desired outcome of distance education. The
two terms are often used interchangeably.
dynamic-link library (DLL):
An API routine that user-mode applications
access through ordinary procedure calls. The code for the API routine is
not included in the user’s executable image. Instead, the operating system
automatically modifies the executable image to point to DLL procedures at
run time.
Domain Name System (DNS):The
naming service used on the Internet to provide standard naming conventions
for IP computers.
dock:
To insert or remove a device in a computer system.
docking station:
A base unit into which you can
insert portable hardware and that includes drive bays, expansion slots,
and additional ports.
Drive Parameter Block (DPB):
Identical to the BIOS
Parameter Block, except that it is in memory. Applications should access
the DPB instead of the boot sector for logical drive information. Proper
programming guidelines
have always stated that
applications should go through the operating system for information
instead of going to the hardware itself.
dotted decimal notation:
A method of signifying IP addresses in which each set of eight
bits is separated from the next eight bits by a period.
Download: (noun) A file that's transferred or copied to a
user's computer from another connected individual computer, a computer
network, a commercial online service, or the Internet. (verb) To transfer or
copy a file to a user's computer from another connected individual computer,
a computer network, a commercial online service, or the Internet.
www.tartoos.com
Download:
The process of retrieving a file from a remote computer. The file is copied
from the Internet server to your computer, where you can view it and use it.
Your computer "downloaded" this glossary web page to your computer so that
you could read it.
DS (Digital
Signal):
The r ate and format of a digital signal, for example, DS-1
or DS-3. Often used synonymously with T, as in T1 or T3, although the T technically refers to the type of equipment. See
T1 and
T3.
DS1 : A high-speed
line capable of delivering 1.54 Mbps (1,540K) in both directions, and
divided into 24 data-bearing channels.
DS1C : A high-speed
line capable of delivering 3.15 Mbps (3,150K) in both directions.
DS2 : A high-speed
line capable of delivering 6.31 Mbps (6,310K) in both directions.
DS3 : A high-speed
line capable of delivering 44.7 Mbps (44,700K) in both directions.
DSP : Digital signal
processor. A specialized processor, usually for handling audio or video
signals.
DSVD : Digital
Simultaneous Voice and Data.
www.tartoos.com
DSL (digital
subscriber line): A broadband Internet access method that
sends data over standard phone lines at speeds up to 7 Mbps. DSL is
available to subscribers who live within a certain distance of the necessary
router.
DVD (digital
versatile disc):
Optical disks that are the same size as CDs but are double-sided and have
larger storage capacities.
DVI (digital
video interactive):
A format for recording digital video onto compact disk, allowing for
compression and full-motion video. www.tartoos.com
Dynamic HTML:
A collection of features that extends the capabilities of traditional
HTML, giving Web authors more flexibility, design options, and creative
control over the appearance and behavior of Web pages.
dynamic type information
:
Type information that changes
when a user attaches code. An object can have dynamic or static type
information; it has one dynamic type information object for its lifetime,
regardless of how often its type information changes. See also type
information.
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