- Digital audio tape. A consumer recording and playback media for
- data rate
- The speed of a data transfer process, normally expressed in bits per
second or bytes per second.
- Display data channel. The Plug and Play baseline for monitors. The
communications channel between a monitor and the display adapter to which it
is connected. This channel provides a method for the monitor to convey its
identity to the display adapter.
- Device driver interface.
- Device driver kit.
- To reverse the procedure conducted by compression software, and thereby
return compressed data to its original size and condition.
- The degree of darkness of an image. Also, the percent of screen used in an
- 1. Any circuit that performs a specific function, such as a parallel
port. 2. For WDM, usually refers to a device object, but also refers to a
unit of hardware—for example, an audio adapter—that is detected by Plug and
- Device Bay
- An industry specification that defines a mechanism for both peripheral
devices and system bays that allows adding and upgrading PC peripheral devices
without opening the chassis.
- device ID
- A unique ASCII string created by enumerators to identify a hardware device
and used to cross-reference data about the device stored in the registry.
Distinguishes each logical device and bus from all others on the system.
- device node
- The basic data structure for a given device, built by the Configuration
Manager. Device nodes are built into memory at system startup for each device
and enumerator. Each device node contains information about the device, such
as currently assigned resources. The complete hierarchical representation of
all device nodes, representing all currently installed devices, is referred to
as the hardware tree.
- device object
- A kernel-mode–only object type used to represent a physical, logical, or
virtual device whose driver has been loaded into the system.
- See device node.
- Device-independent bitmap. A file format designed to ensure that bitmap
graphics created using one application can be loaded and displayed in another
application exactly the way they appeared in the originating application.
- A method of signal representation by a set of discrete numerical values,
as opposed to a continuously fluctuating current or voltage. Compare
- digital video
- A video signal represented by computer-readable binary numbers that
describe a finite set of colors and luminance levels. Compare with
- The process of transforming analog video signal into digital information.
- disk I/O controller
- Also HDC. A special-purpose chip and circuitry that directs and
controls reading from and writing to a computer's disk drive.
- Dynamic link library. 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.
- Direct memory access. A method of moving data from a device to memory (or
vice versa) without the help of the microprocessor. The system board uses a
DMA controller to handle a fixed number of channels, each of which can be used
by only one device at a time.
- Desktop Management Interface. A framework created by the DMTF. DMTF
specifications define industry-standard interfaces for instrumentation
providers and management applications.
- Desktop Management Task Force.
- To insert a portable computer into a base unit. Cold docking means the
computer must begin from a power-off state and restart before docking. Hot
docking means the computer can be docked while running at full power. See
also warm docking.
- docking station
- The base computer unit into which a user can insert a portable computer,
expanding it to a desktop equivalent. A typical docking station provides drive
bays, expansion slots, all the ports on an equivalent desktop computer, and AC
- A physical device, attached to a PC's I/O port, that adds hardware
- Deferred procedure call. Method used in Windows NT/Windows 2000 for
- Kernel-mode code used either to control or emulate a hardware device.
- driver stack
- Device objects that forward IRPs to other device objects. Stacking always
occurs from the bottom up and is torn down from the top.
- Digital signal processor. An integrated circuit designed for high-speed
data manipulations. Used in audio, communications, image manipulation, and
other data-acquisition and data-control applications.
- Optical disk storage that encompasses audio, video, and computer data.
- dynamic detection
- The process by which a system can detect that a new device has been added
or removed from the PC. This process allows the operating system and
applications to immediately begin using the added devices or stop using the
removed devices without rebooting the system.