I

I               Interrupt disable flip-flop. A flip-flop, often labeled I,
                that disables all nonmaskable interrupts.
i860            A high performance RISC processor by Intel.
IA5             International Alphabet number 5. The standard character code 
                defined by CCITT and recommended by ISO. It is almost 
                identical to the ASCII code.
IAB       	Internet Architecture Board.
IAC             InterApplication Communication.
IAG             Instruction Address Generation.
IAK       	Internet Access Kit.
IAL		International Algebraic Language.ALGOL was first called IAL.
IANA      	Internet Assigned Numbers Authority.
IAP       	Internet Access Provider.
iAPX 186        High integration 16-bit microprocessor.
iAPX 286/10     High performance microprocessor with memory management and
                protection.
IAS             A first-generation computer designed by John von Neumann and
                his colleagues and built at the Institute of Advanced Studies
                at Princeton.
IAT       	Import Address Table.
IAUP      	Internet User Account Provider.
IBC       	Instrument Bus Computer.
iBCS      	Intel Binary Compatibility Specification.
IBF             Input Buffer Full. A status flag used by the 8255A PPI during
                input.
IBM             International Business Machines corporation. One of the
                primary manufacturers of computer equipment (usually, though
                not exclusively, large-scale equipment).
IBM 7090        An early IBM scientific computer (circa 1960) that used
                discrete-transistor technology.
IBM-GL    	International Business Machines corporation Graphics Language.
IBM MIPS        A measure of performance relative to an IBM computer. See
                also MIPS.
IBM PC          A personal computer introduced in 1981 by IBM that uses the
                8088 microprocessor.
IBM PC AT       An IBM PC computer that uses the 80286 microprocessor and has
                a PC AT I/O Channel Bus.
IBM PS/2        A family of computers (Personal System/2) introduced in 1987
                to replace the IBM PC family; the highest-performance models
                have a bus with Micro Channel Architecture. See also MCA.
IBM RISC System/6000
                A family of superscalar (capable of issuing more than one
                instruction during each clock cycle) RISC machines introduced
                in 1990.
IBM RS/6000     See IBM RISC System/6000.
IBM System/360  Introduced by IBM in 1964, a family of 32-bit general-purpose
                register-set machines intended for both business and
                scientific applications.
IBM System/370  A descendent family of the System/360 that supports a larger
                logical address space and virtual memory.
IBM System/R6000
                See IBM RISC System/6000.
IC		Input Circuit.
IC              Instruction fetch Cycle.
IC              Integrated Circuit. A single semiconductor component
                containing from two to millions of discrete components
                (e.g. transistors).
IC		Interrupt Controller.
ICA             Intelligent Communications Adapter. ICAs support a variety of
                line protocols, including asynchrnous, SDLC, HDLC, and X.25.
ICA       	Intra-application Communications Area.
ICAS      	Intel Communicating Applications Specifications.
ICB       	Internet Citizen's Band.
ICCP      	Institute for the Certification of Computing Professionals.
ICDA            Integrated Cached Disk Array.
ICE       	In-Circuit Emulator.
ICI       	Image Component Information.
ICL       	Interface Clear.
ICLID		Incoming Call-Line IDentification.
ICM       	Image Color Matching.
ICM             Internet Communications Manager. ICM is designed to provide
                internetworking for XNS-based LANs through the use of
                asynchronous communications line.
ICMP            Internet Control and Message Protocol. The ICMP is a special-
                purpose set of messages that are used between internetwork
                nodes to resolve problems in packet processing.
.ICO      	Icon. File name extension.
ICO             Internet Connectivity Option.
iCOMP     	Intel COmparative MicroProcessor index.
ICOT            Institute for new generation COmputer Technology.
ICP       	Integrated Channel Processor.
ICR             Interrupt Code Register. A register containing all the
                interrupt-code flags for the system.
ICS       	Intuitive Command Structure.
ICU       	ISA Configuration Utility.
ID        	IDentification.
ID		IDentifier.
IDA       	Integrated Digital Access.
IDA		Intelligent Disk Array.
IDA		Intelligent Drive Array.
IDAPI     	Integrated Database Application Programming Interface.
IDD             Integrated Data Dictionary.The IDD stores a variety of
                entities in a DBMS. Basic entities include users, systems,
                files, data items, reports, transactions, programs, and
                program entry points.
IDDE      	Integrated Development and Debugging Environment.
IDE       	Imbedded Drive Electronics.
IDE             Integrated Development Environment.
IDE             Integrated Drive Electronics. A type of disk drive interface
                which essentially extends the PC's expansion bus all the way
                to the drive and places the drive controller on the disk
                drive itself.  See also ESDI.
IDE          	Intelligent Drive Electronics.
IDE          	Interactive Design and Engineering.
IDE          	Interface Design Enhancement.
IDEA            International Data Encryption Algorithm.
IDF             Intermediate Distributing Frame.
IDI             Initial Domain Identifier.
IDIV      	Integer DIVide.
IDL             Interface Definition Language.
IDLC            Integrated Digital-Loop Carrier.
IDM             Intelligent Database Machine. The IDM, introduced by Britton-
                Lee in 1982, is the first commercial database machine.
IDMS            Integrated Database Management System.It is currently
                markated by Computer Associates under the name CA-IDMS. The
                network model has had a number of major commercial DBMS
                implementations.
IDP             Initial Domain Part.
IDP             Integrated Data Procesing.
IDP             Internet Datagram Protocol.
IDS             Information Delivery Service.
IDT       	Interrupt Descriptor Table.
.IDX      	InDeX. File name extension.
IEC             InterExchange Carrier.
IEC       	International Electrotechnical Commission.
IEEE            Institute of Electrical and Electronics Engineers.
IEF       	Information Engineering Facility.
IEMSI     	Interactive Electronic Mail Standard Identification.
IETF            Internet Engineering Task Force.
IF              Intermediate Frequency.
IF              Interrupt Flag. The interrupt-disable flip-flop of the 8088
                microprocessor.
I/F       	InterFace.
IFC             InterFace Clear. Allows seizure of bus control and/or
                initialization of the bus.
IFD       	Image File Directory.
IFF             Interchange File Format. Developed by Electronic Arts and
                also used by DPaint.
IFG       	Incoming Fax Gateway.
IFP             Instruction Fetch Pipeline.
IFS             Installable File System. An Installable File System which
                allows non-DOS format media to be used by DOS.  In most ways,
                an IFS is very similar to a networked drive, although an IFS
                would typically be local rather than remote.
IFS             Iterated Function System. An object is self-similar if small
                pieces of itself are identically shaped versions of the
                complete object, only on a smaller scale. A fractal can be
                defined by exactly specifying the relationship between itself
                and its self-similar parts.Michael Barnsley has developed
                this approach and named it IFS.
IFSM      	Information Systems Management.
IFSMgr          Installable File System Manager.
IGA       	Integrated Graphics Array.
IGC       	Integrated Graphics Controller.
IGES            Initial Graphics Exchange Specification. The National Bureau
                of Standards defined a common neutral interface or format of
                data called IGES to facilitate interchange of data among CAD
                systems or from a CAD system to a CAM system.
IGFET           Insulated-Gate Field-Effect Transistor.
IGMP      	Internet Group Multicast Protocol.
IGP             Interior Gateway Protocol. The routing protocol used in the 
                gateways of a TCP/IP internetwork to obtain the shortest path 
                routes through the internet.
IGRP      	Interior Gateway Routing Protocol.
IGS       	Internet Go Server.
IHD       	Integrated Help Desk.
IHV       	Independent Hardware Vendor.
IIF       	Immediate IF.
IIR       	Immediate Impulse Response.
IIR             Interrupt Identification Register.
IITF      	Information Infrastructure Task Force.
ILLIAC IV       A one-of-a-kind SIMD processor array (circa 1966) developed
                at the University of Illinois and consisting of 64-word-
                parallel processing elements (PEs), a PE control unit and a
                Burroughs host computer.
ILMI            Interim Local Management Interface.
ILN             Internal Line Number.
IMA             International MIDI Association. Formed to ensure that all
                manufacturers complied with the MIDI Specification 1.0.
IMACS     	Image Management And Communication System.
IMAP      	Internet Message Access Protocol.
IMAX      	Image Maximum.
IMDS      	IMage Data Stream format.
IME       	Input Method Editor.
IMG       	IMaGe.
IML       	Initial Microcode Load.
IMP       	Information/Interface Message Processor.
IMPA      	Intelligent Multi-Port Adapter.
IMR       	Internet Monthly Report.
IMR             Interrupt-Mask Register. The register that holds the
                interrupt mask.
IMS             Information Management System.The system cooperate with DB2
                facilities to provide data communications and transaction
                management. See also CICS.
IMS		Intermediate Maintenance Standards.
IMS/VS-DC       Information Management System/Virtual Storage-Data
                Communication. IMS/DC is a data communication environment
                that supports hierarchical IMS databases.
IMTC      	International Multimedia Teleconferencing Consortium.
IMTV      	Interactive Multimedia TeleVision.
IMUL      	Integer MULtiply.
IN        	INput.
INC       	INCrement.
.IND      	INDex File name extension.
I-NETS          Institutional NETworkS.
.INF      	INFormation. File name extension.
.INI      	INItialize. File name extension.
INIT      	INITialization.
INIT		INITialize.
INM       	Integrated Network Management.
INS       	INput String.
INS		Integrated Network Server.
INT       	INTeger.
INT		INTernal.
INT		INTerrupt.
INT             An interrupt request signal.
INT          	INTernational. Organization Domain name.
I/O             Input/Output. Any transfer of data between a computer and an
                external device.
IOCC      	Input/Output Channel Converter.
IOCC          	Input/Output Controller Chip.
IOCS            Input/Output Control System.
IOCTL     	Input/Output ConTroL.
IOPL      	Input/Output Priviledge Level.
IOS             Input/Output System.
IOS             Internetwork Operating System.
IOSGA     	Input/Output Support Gate Array.
IP		Initial Permutation.
IP              Instruction Pointer in the 8088 microprocessor.
IP              Internet Protocol. The lower level (transport layer) of the
                TCP/IP protocol suite.  See also TCP, TCP/IP.
IPC       	Instructions Per Clock.
IPC             InterProcess Communication. Any one of numerous methods for
                allowing two or more separate processes to exchange data.
IPDS      	IBM Personal Dictation System.
IPDS          	Intelligent Printer Data Stream.
IPF       	Information Presentation Facility.
IPL     	Information Programming Language.
IPL       	Initial Program Load/Loader.
IPL          	Ion Projection Lithography.
IPM       	InterPersonal Message.
IPng            Internet Protocol Next Generation.
IPOT            Inductive POTentiometer.
IPRA		Internet Policy Registration Authority.
IPS             Image Processing Server.
iPSC/2          An MIMD hypercube processor by Intel, whose computer modules
                comprise 80386 microprocessors with optional vector
                coprocessors and floating-point coprocessors.
IPSE      	Integrated Project Support Environment.
IPTC      	International Press Telecommunicat4ions Council.
IPX             Internet(work) Packet eXchange. A low-level layer of Novell's
                NetWare networking software. IPX handles addressing and
                routing issues. See also SPX.
IQL       	Interactive Query Language.
IR        	InfraRed.
IR              Instruction Register. A control-unit register that holds the
                instruction while the circuitry decodes and executes it; not
                generally part of the computer's instruction-set architecture.
IR              Intermediate Register.
IRB             Instruction Reorder Buffer.
IRC             Internet Relay Chat.
IRD       	Integrated Receiver/Descrambler.
IRDA      	InfraRed Data Association.
IRDS      	Information Resource Dictionary System.
IRET      	Interrupt RETurn.
IRF       	Inheritance Rights Filter.
IRIS            Image Recognition Integrated Systems.
IRIS            Intermediate System. The name used by the OSI to decribe the 
                device that interconnects two networks together - also known 
                as a router or a gateway.
IRL       	Interactive Reader Language.
IRL		Inter-Repeater Link.
IRLED     	InfraRed Light Emitting Diode.
IRM       	Information Resource Management.
IRM		Inherent Rights Mask.
IRQ             Interrupt ReQuest. A hardware line connected to the interrupt
                controller chip which signals that a CPU interrupt should be
                generated.
IRTF      	Internet Research Task Force.
IRX       	Information Retrieval eXperiment.
IS        	Information System.
IS		Interrupt Status.
ISA             Instruction-Set Architecture. The appearance of a computer
                from a machine-language programmer's point of view, including
                its datatypes, register set, instruction set and run-time
                operation (interrupt and I/O structure).
ISA             Industry-Standard Architecture. The expansion bus used by the
                IBM PC/AT.  See also EISA.
ISAM      	Indexed Sequential-Access Management/Method.
ISBN      	International Standard Book Number.
ISC       	Instruction Set Computer.
ISD       	Image Section Descriptor.
ISD		Instructional Systems Design.
ISDN            Integrated Services Data Networks.
ISDN            Integrated Services Digital Networks. The ISDN lines provide
                two voice and one packet data circuit over lines previously
                used for only one voice circuit or one voice-grade data
                circuit.
ISH       	Information Super Highway.
ISI       	Internally Specified Index.
ISIS      	Integrated Systems and Information Services.
ISL       	Interactive System Language.
ISMF      	Interactive Storage Management Facility.
ISN             Information Systems Network. In mid-1983 AT&T was floating
                proposals (although with no prodect) for a "centralized bus"
                LAN topology that was little more than a repackaged EPABX
                using a traditional star. This became AT&T's ISN.
ISOC      	Internet SOCiety.
ISO/OSI         International Standards Organization Open Systems
                Interconnection. A seven-tiered network model.
ISP       	Internet Service Provider.
ISP          	Interrupt Stack Pointer.
ISP		Interrupt Status Port.
ISPF      	Interactive System Programming Facility.
ISR       	Information Storage and Retrieval.
ISR          	Interrupt Service Routine.
ISSN      	International Standard Serial Number.
ISV		Independent Software Vendor.
IT              Information Technology.
ITB       	Information Technology Branch.
ITB		Intermediate Text Block.
ITC       	International Typeface Corporation.
ITN       	Identification Tasking and Networking.
ITR       	Internet Talk Radio.
ITU             International Telecommunications Union.
ITUG      	International Telecommunications User Group.
ITV       	Interactive TeleVision.
ITX       	Intermediate TeXt block.
IU              Integer Unit.
IUAP      	Internet User Account Provider.
IUS/ITB   	Interchange Unit Separator/Intermediate Transmission Block.
IV		Initialization Vector.
IVIS      	Interactive Video Information System.
IVL       	Independent Vendor League.
IVL		Intel Verification Lab.
IVR       	Interactive Voice Response.
IVS       	Interactive Videodisk System.
IVT       	Interrupt Vector Table.
IV&V      	Independent Verification & Validation.
I-WAY     	Information highWAY.
IXC       	Interchange Carrier.
IXF             Integration eXchange Format.

