Glossary
211
document
— Any file created with an application and, if saved to disk,
given a name by which it can be retrieved. See also
file
.
double-click
— To press and release the pointing device’s primary
button rapidly twice without moving the pointing device. In the
Windows
®
operating system, this refers to the pointing device’s left
button, unless otherwise stated.
double-density diskette
— A 3.5-inch diskette that can hold up to
720 KB of information (half the capacity of a high-density diskette).
See also
diskette, high-density diskette.
download
— (1) In communications, to receive a file from another
computer through a modem or network. (2) To send font data from
the computer to a printer. See also
upload
.
drag
— To hold down the mouse button while moving the pointer to
drag a selected object. In the Windows
®
operating system, this refers
to the left mouse button, unless otherwise stated.
driver
— See
device driver
.
DVD
— An individual digital versatile (or video) disc. See also
DVD-
ROM
.
DVD-ROM (digital versatile [or video] disc read-only memory)
— A
very high-capacity storage medium that uses laser optics for reading
data. Each DVD-ROM can hold as much data as several CD-ROMs.
Compare
CD-ROM.
E
emulation —
A technique in which a device or program imitates another
device or program.
enable
— To turn on a computer option. See also
disable
.
executable file
— A computer program that is ready to run. Application
programs and batch files are examples of executable files. Names of
executable files usually end with a .bat or .exe extension.
expansion device
— A device that connects to a computer to expand its
capabilities. Other names for an expansion device are port expander,
port replicator, docking station, or network adapter.
extension
— See
file extension
.
external device
— See
device.
