Dell PowerEdge 400SC - Manual (Page 20)

control panel
The part of the system that contains indicators and controls, such as the power switch and power indicator
controller
A chip that controls the transfer of data between the processor and memory or between the processor and a peripheral
conventional memory
The first 640 KB of RAM. Conventional memory is found in all systems. Unless they are specially designed, MS-DOS® programs are limited to running in
conventional memory.
coprocessor
A chip that relieves the system's processor of specific processing tasks. A math coprocessor, for example, handles numeric processing.
CPU
Central processing unit. See processor.
DC
Direct current
DDR
Double-data rate
device driver
A program that allows the operating system or some other program to interface correctly with a peripheral. Some device drivers—such as network drivers—
must be loaded from the config.sys file or as memory-resident programs (usually, from the autoexec.bat file). Others must load when you start the program
for which they were designed.
DHCP
Dynamic Host Configuration Protocol
diagnostics
A comprehensive set of tests for your system
DIMM
Dual in-line memory module. See also memory module.
DIN
Deutsche Industrie Norm
directory
Directories help keep related files organized on a disk in a hierarchical, "inverted tree" structure. Each disk has a "root" directory. Additional directories that
branch off the root directory are called subdirectories. Subdirectories may contain additional directories branching off them.
DMA
Direct memory access. A DMA channel allows certain types of data transfer between RAM and a device to bypass the processor.