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Glossary
This glossary contains terms and abbreviations that are
used in this manual. It includes terms and definitions
from IBM Vocabulary for Data Processing,
Telecommunications, and Office Systems, GC20-1699.
Symbols used in this glossary are as follows:
• An asterisk (*) identifies definitions from the
American National Dictionary for Information
Processing, published by the Computer and Business
Equipment Manufacturers Association.
• The symbol (CCITT /ITU) identifies definitions from
the CCITT Sixth Plenary Assembly Orange Book,
Terms and Definitions and working documents
published by the International Telecommunication
Union, Geneva, 1978.
• The symbol (ISO) identifies definitions from
published sections of the ISO Vocabulary of Data
Processing, developed by the International
Standards Organization, Technical Committee 97
Subcommittee 1.
'
• The symbol (TC97) identifies definitions from drafts
and working papers under development by the
International Standards Organization, Technical
Committee 97, Subcommittee 1.
access method. A technique for moving data between
main storage and input/output devices.
Advanced Communications Function for the Network
Control Program (ACF/NCP). An IBM program
product that provides communication controller support
for single-domain and multiple-domain networks.
alert. In NPDA, a notification about a high priority
event that warrants immediate attention. This data base
record is generated for certain event types that are
defined by user-constructed filters.
alphanumeric field. A field that may contain any
alphabetic, numeric, or special characters.
alternate character set. A character set, located in the
terminal, from which characters are obtained for display
and printing by using the graphic escape character in the
data stream.
alternate cursor. An image reversal of each dot in the
character cell at the cursor position.
ANSI X3.64. American National Standard Additional
Controls for Use with American National Standard
Code for Information Interchange (ASCII). A standard
that defines a set of control functions that augments
ASCII control functions as described in ANSI X3.4 and
that controls input and output for two-dimensional
character-imaging devices, such as displays or printers.
*
ASCn. American National Standard Code for
Information Interchange. The standard code, using a
coded character set consisting of 7-bit coded characters
(8 bits including parity check), used for information
interchange among data processing systems, data
communication systems, and associated equipment. The
ASCII set consists of control characters and graphic
characters.
Ascn pass-through. For the 3708, the transmission of
unmodified data between an ASCII device and an
ASCII host.
Ascn pass-through mode. For an ASCII device
attached to a 3708, a mode of operation in which the
device communicates with an ASCII host.
asynchronous. Without regular time relationship;
unexpected or unpredictable with respect to the
execution of a program's instructions.
attention. An I/O interruption generated
asynchronously by a display station, usually as a result
of an action taken by the operator of the device.
attention identification (AID). A code that the terminal
sends in the inbound data stream to identify the
operator action or structured field function that caused
the data stream to be sent to the application program.
An AID is always sent as the first byte of the inbound
data stream. Structured fields in the data stream may
also contain an AID.
attribute. A characteristic.
attribute select keyboard. A keyboard that enables the
operator, when permitted by the program, to change the
character attributes of the keyed-in character.
attribute type. A code that identifies the characteristics
from which the associated set of attribute values can be
selected. See also extended highlighting, and character
set.
attribute value. A code immediately following the
attribute type in the data stream that specifies a
particular characteristic from the set defined by the
attribute type.
audible alarm. A special feature that sounds a short,
audible tone automatically when a character is entered
from the keyboard into the next-to-last character
position on the screen. The tone can also be sounded
under program control.
Glossary
X-5
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