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Glossary 63
Bus
A communication channel carrying signals from any device
used by the system to another device. For example, data
being transferred to and from a hard disk travels on a bus.
Byte
The basic unit of measure for computer memory. A
character, such as a letter of the alphabet, uses one byte of
memory. Computer memory is often measured in kilobytes
or megabytes. Each byte is made up of eight bits.
Check box
An element of a dialog box. A check box is either filled or
left blank, indicating a yes-or-no decision.
Click
To press the left mouse button and then release it.
CD-ROM (compact disc read-only memory)
A disk, which is similar in appearance to an audio compact
disc, that can store large amounts of data, video, and sound.
Data can be read from, but not written to, a CD-ROM.
CMOS (complementary metal-oxide semiconductor) memory
The memory that stores the configuration you establish by
running the computer’s setup program. CMOS memory
uses very little power and stores the configuration
information even when the computer is turned off.
Command
A word or series of words you use to initiate an operating
system action.
Command line
The commands and their parameters that you type at the
(MS-DOS) command prompt of an operating system.
Command prompt
A character or string of characters that indicate the
beginning of the operating system command line.
CONFIG.SYS file
A file on the boot disk that configures MS-DOS. The
commands in a CONFIG.SYS file (if one exists on your boot
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