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186
Glossary
drag: To hold down the mouse button while moving the cursor. Refers to
the left mouse button, unless otherwise stated.
driver: See device driver.
dual in-line package (DIP): A standard for packaging integrated circuits
by enclosing them in a rectangle of ceramic or plastic with
downward-pointing connection pins.
duplex: The method used to transmit data in both directions between two
devices. Synonymous with full duplex. See also half duplex, full
duplex.
E
EISA: Extended ISA, an expansion bus design that maintains
compatibility with ISA but provides a 32-bit data path and
additional features. It provides much faster data throughput than
ISA and is used in high-performance servers.
emulation: A technique in which a device or program imitates another
device or program.
enable: To turn on a computer option.
erase: See delete.
error-correcting code: Code designed for transmission of electronic data
that encodes data in such a way that transmission errors may be
detected and corrected by examination of the encoded data on the
receiving end. Error-correcting code is used in most modems and in
some RAM. In the latter case, circuitry is used that generates
checksums to correct errors greater than one bit.
escape: (1) To cancel the task currently in progress. (2) A code (ASCII
code 27, generated by the Esc key) telling the computer that what
follows are commands, not data. Used with peripheral devices such
as printers and modems.
Ethernet: A local area network (LAN) standard for hardware,
communications, and cabling. It links network nodes in a bus
topology using coaxial cable, or in a star topology using fiber-optic
cable or twisted-pair cable. Normally, all nodes share the total
bandwidth, which is 10 Mbps (Ethernet), 100 Mbps (Fast Ethernet),
or 1000 Mbps (Gigabit Ethernet). With switched Ethernet, each
sender and receiver pair have the full bandwidth.
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