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`- i -
`
`

`

`IBM DICTIONARY
`OF COMPUTING
`
`Compiled and edited by
`GEORGE MCDANIEL
`
`MCGRAW-HILL, INC.
`New York San Francisco Washington, D.C. Auckland Bogota’
`Caracas Lisbon London Madrid Mexico City Milan
`Montreal New Delhi San Juan Singapore
`Sydney Tokyo Toronto
`
`- ii -
`
`

`

`Limitation of Liability
`While the Editor and Publisher of this book have made reasonable efforts to
`ensure the accuracy and timeliness of the information contained herein, nei-
`ther the Editor nor the Publisher shall have any liability with respect to loss or
`damage caused or alleged to be caused by reliance on any information con-
`tained herein.
`
`Copyright © 1994 by International Business Machines Corporation. All rights
`reserved. Printed in the United States of America. Except as permitted under
`the United States Copyright Act of 1976, no part of this publication may be
`reproduced or distributed in any form or by any means, or stored in a data
`base or retrieval system, without the prior written permisssion of the pub-
`lisher.
`
`234567890 DOC/DOC 9987654
`
`ISBN 0-O7—031488-8 (HC)
`ISBN 0-07-031489-6 (PBK)
`
`The sponsoring editor for this book was Daniel A. Gormeau and the
`production supervisor was Thomas G. Kowalczyk.
`
`Printed and bound by R. R. Donnelley & Sons Company.
`
`Tenth Edition (August 1993)
`This is a major revision of the IBM Dictionary of Computing, SC20—1699—8,
`which is made obsolete by this edition. Changes are made periodically to the
`information provided herein.
`It is possible that this material may contain reference to, or information about,
`IBM products (machines and programs), programming, or services that are
`not announced in your country. Such references or information must not be
`construed to mean that IBM intends to announce such IBM products, pro-
`gramming, or services in your country. Comments may be addressed to IBM
`Corporation, Department E37/656, P. O. Box 12195, Research Triangle Park,
`NC 27709.
`
`International Edition
`
`Copyright © 1994 by International Business Machines Corporation. Exclusive
`rights by McGraw-Hill, Inc. for manufacture and export. This book cannot be
`re—exported from the country to which it is consigned by McGraw~Hill. The
`International Edition is not available in North America.
`When ordering this title, use ISBN O—O7—113383—6.
`
`This book is printed on acid—free paper.
`
`-iii-
`
`- iii -
`
`

`

`interoffice trunk
`
`[355]
`
`interrupt register
`
`interoffice trunk A direct trunk between local central
`offices in the same exchange.
`
`Enhanced X—Windows, a communication path.
`also client.
`
`See
`
`interoperability (1) The capability to communicate,
`execute programs, or
`transfer data among various
`functional units in a way that requires the user to have
`little‘ or no knowledge of the unique characteristics of
`those units.
`(T)
`(2) In SAA usage,
`the ability to
`link SAA and non-SAA environments and use the
`combination for distributed processing.
`
`interrecord gap (1) The space between two consec-
`utive records on a data medium.
`(I)
`(A)
`(2) Dep-
`recated term for interblock gap.
`
`(IRS) In BSC, a
`interrecord-separator character
`transmission control character used to separate records
`within a block of data.
`
`interpret To analyze and execute each statement in a
`source program before translating and executing the
`next statement. (T)
`
`interrogation The process whereby a master station
`requests a slave station to indicate its identity or its
`status.
`(T)
`(A)
`
`INTERPRET AS Command (IAC) In Telnet, a
`character that identifies the character or characters fol-
`lowing it as a command for Telnet to process.
`
`interpreter (1) A computer program that can inter-
`pret.
`(T)
`(2) A program that
`translates and exe-
`cutes each instruction of a high—level programming
`language before it
`translates and executes the next
`instruction.
`(3) A device that prints on a punched
`card the characters corresponding to hole patterns
`punched in the card.
`(T)
`(4) Synonymous with
`interpretive program.
`
`interpreting Translating and executing each source
`language statement of a computer program before
`translating and executing the next statement.
`
`interpretive code The instruction repertoire for the
`source language input to an interpreter. (A)
`
`interpretive execution (l) Execution of an instruc-
`tion before the next instruction is interpreted and exe-
`cuted.
`(2) In DPCX, the execution of instructions by
`application function routines (AFRS).
`
`interrupt (1) A suspension of a process, such as exe-
`cution of a computer program caused by an external
`event, and performed in such a way that the process
`can be resumed. (A)
`(2) An instruction that directs
`the microprocessor to suspend what it is doing and run
`a specified routine. When the routine is complete, the
`microprocessor resumes its original work.
`See also
`routine.
`(3) To stop a process in such a way that it
`can be resumed.
`(4) In data communication,
`to take
`an action at a receiving station that causes the sending
`station to end a transmission.
`(5) To temporarily stop
`a
`process.
`(6) Synonymous with
`interruption.
`(7) See vectored interrupt.
`(8) Contrast with excep-
`tion, signal.
`
`interrupt confirmation packet In X.25 communi-
`cations, a packet used to acknowledge the receipt of
`an interrupt packet.
`
`interrupted isochronous transmission Synonym for
`burst transmission.
`
`interrupt handler See frrst—level
`second-level interrupt handler.
`
`interrupt handler,
`
`interpretive program Synonym for interpreter. (T)
`
`interruptible Synonym for enabled.
`
`decodes
`that
`routine
`routine A
`interpretive
`instructions written as pseudocodes and immediately
`executes the instructions. Contrast with compile.
`
`interpret table In VTAM, an installation—defined cor-
`relation list that translates an argument into a string of
`eight characters.
`Interpret tables can be used to trans-
`late logon data into the name of an application
`program for which the logon is intended.
`
`interprocess communication (1) In the OS/2 oper-
`ating system,
`the exchange of information between
`processes or threads through semaphores, queues, and
`shared memory.
`(2) In the AIX operating system, the
`process by which programs communicate data to each
`other and to synchronize their activities. Semaphores,
`signals, and internal message queues are common
`methods of inter—process communication.
`(3) In AIX
`
`See also
`(1).
`interrupt
`interruption Synonym for
`external interruption, I/O interruption, machine check
`interruption,
`program—controlled
`interruption, SVC
`interruption.
`
`in a
`interruption network A network of circuits
`computing system that continuously monitors system
`operation. The network detects events that normally
`require intervention and direction by the supervisor,
`and it initiates interruptions.
`
`interrupt packet In X.25 communications, an expe-
`dited packet that is allowed to overtake normal data
`packets, which are delivered in sequence.
`
`register A special purpose register
`interrupt
`holds data necessary for handling interrupts.
`(T)
`
`that
`
`.‘.-,.r;..:~.».t
`
`