Toshiba 8000 series, Руководство пользователя

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Part III: Appendixes
Glossary
246
H
half duplex: A type of data transmission in which data flows between
two devices in one direction at a time. See also full duplex .
handles: Eight small boxes that appear around a graphical object when
you select it. You can use the handles to change the size and shape
of the object. Dragging the middle handle on one side of an object
stretches or shrinks the object in that direction, changing its shape as
well as its size. Dragging a corner handle makes the object larger or
smaller while preserving its shape.
handshake: The series of signals between a computer and a peripheral
device (such as a modem) that sets the parameters required for
exchanging data.
hard disk: A storage device composed of a rigid platter or platters that
can be magnetically coded with data. Hard disks hold much more
information than removable disks and are used for long-term
storage of programs and data. Hard disks are usually not user-
removable. By default, the hard disk is referred to as drive C.
hardware: The physical, electronic and mechanical components of a
computer system, including devices such as a screen, disk drive,
printer, pointing device and processor.
hexadecimal: The base-16 numbering system used by programmers to
represent binary numbers. Digits above 9 are represented by letters
(the 15 digits are 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F). Two
hexadecimal digits are equivalent to the eight bits in a byte. For
example, F1 in hexadecimal is equivalent to 11110001 in binary.
See also
binary, decimal .
high-density disk: A 3.5-inch disk that holds 1.44 MB of data.
high memory area: The first 64 KB of extended memory.
hot key: 1) A feature in which certain keys in combination with the
Fn
key can set system options or control system parameters, such as the
battery save mode. 2) A key or combination of keys that activates a
memory resident program.
hot swapping: The ability to replace devices such as PC Cards, optional
modules or USB peripherals while the computer is turned on. Hot
swapping should
not be attempted while the device is in use.