.H Header (file name extension) [C]
HACMP High Availability Cluster Multi-Processing [IBM]
HAL Hard Array Logic¹ + Hardware Abstraction Layer +
House-Programmed Array Logic
HAL * Heuristically Programmed Algorithmic (computer)
[from 1968 movie "2001: A Space Odyssey"]
HAP Host Access Protocol²
HASP Houston Automatic Spooling³ Priority (System)
HBA Host Bus Adapter
HCL Hardware Compatibility List
HCSS High Capacity Storage System
HCU Home Computer User
HD Hard Disk + High Density⁴
HDA Head Disk Assembly
HDCD High Definition Compatible Digital
HDF Hierarchical Data Format⁵ [NCSA]
HDI Head to Disk Interference
HDL Hardware Description Language
HDLC High-Level Data Link Control
HDM Hardware Device Module
HDML Handheld Device Markup⁶ Language
HDR Header
HDSC High Density Signal Carrier [DEC]
HDSL High-Data-Rate Digital Subscriber⁷ Line
HDSS Holographic Data Storage System
HDT Host Digital Terminal
HDTV High Definition Television
HDVD High Definition Volumetric Display
HDW Hardware
HDX Half Duplex
HERC Hercules
HEX Hexadecimal
HFC Hybrid⁸ Fiber-Coaxial
HFS Hierarchical File System [Macintosh]
HFT High Function Terminal [IBM]
HGA Hercules Graphics⁹ Adapter
HGCP Hercules Graphics Card Plus
HH Hour
HIF Hyper-G Interchange Format
HIFD High-Density Floppy¹⁰ Disk
HIL Human Interface¹¹ Link [HP]
HIMEM High Memory
HIPPI High Performance Parallel Interface
HLCO High Low Close Open
HLL High Level Language
HLLAPI High Level Language Application Programming Interface
.HLP Help (file name extension)
HLQ High Level Qualifier
HLS Hue¹², Luminance, Saturation¹³ (color model)
HLT Halt
HMA High Memory Area [Microsoft] +
Hub Management Architecture
HMD Head Mounted Display
HMM Hidden Markov Model
HMMP Hyper-Media Management Protocol
HMOS High Density Metal Oxide¹⁴ Semiconductor¹⁵ +
High Speed Metal Oxide Semiconductor
HMP Host Monitoring Protocol
HOTT Hot Off The Tree (electronic newsletter)
HOV High Occupancy Vehicle
HP Hewlett-Packard (Company)
HPC Handheld Personal Computer
HPCC High Performance Computing¹⁷ and Communications
HPDJ Hewlett-Packard Desk Jet
HPFS High-Performance File System
HPG Hewlett-Packard Graphics
HPGL Hewlett-Packard Graphics Language
HPIB Hewlett-Packard Interface Bus
HPLJ Hewlett-Packard Laser Jet
HPOM Home Page Objects Model [Microsoft]
HPPA Hewlett-Packard Precision Architecture
HPPI High Performance Parallel Interface
HPR High Performance Routing [IBM]
HPSB High Performance Serial¹⁸ Bus
HPUX Hewlett-Packard Unix
HPW High Performance Workstation [Sun]
.HQX BinHex (file name extension) [Macintosh]
HRIS Human Resource Information System
HRG High Resolution Graphics
HRMS Human Resource Management System
HRTF Head Related Transfer Function
HS High Speed
HSB Hue, Saturation, Brightness (color model)
HSC Hierarchical Storage Controller + High Speed Channel
HSI Hue, Saturation, Intensity
HSM Hierarchical Storage Management
HSP High Speed Printer/Processor
HSSI High Speed Serial Interface
HST High Speed Technology [U.S. Robotics]
.HST History + Host (file name extensions)
HSV Hue Saturation value
HTML HyperText Markup Language
HTTP HyperText Transfer Protocol
HTTP-NG HTTP Next Generation
HTTPS HyperText Transfer Protocol Secure
HUD Heads Up Display
HUT Hopkins Ultraviolet Telescope
H/V Horizontal/Vertical¹⁹
HVP Horizontal & Vertical Position
H/W Hardware
HWCP Hardware Code Page
HWD Height-Width-Depth
.HYP Hyphenation (file name extension)
HYTELNET Hypertext-browser for Telnet Accessible Sites
Hz Hertz
I...
IAB Internet Architecture Board
IAC Inter-Application Communication [Macintosh]
IAG Instruction Address Generation
IAK Internet Access Kit²⁰ [IBM]
IAL * International Algebraic Language
(ALGOL was first called IAL)
IANA Internet Assigned Numbers Authority
IAP Internet Access Provider
IAS Internet Access Server
IAT Import Address Table
IAUP Internet User Account Provider
IBC Instrument Bus Computer
iBCS Intel Binary²¹ Compatibility Specification
IBIP Information Based Indicia Program [U.S. Postal²² Service]
IBM International Business Machines (Corporation)
IBM-GL IBM Graphics Language
IC Input²³ Circuit + Integrated Circuit + Interrupt Controller
ICA Intelligent Console Architecture +
Intra-application Communications Area
ICAP Internet Calendar Access Protocol [Lotus]
ICAS Intel Communicating Applications Specifications
ICB Internet Citizen's Band
ICCP Institute for the Certification of
Computing Professionals
ICD International Code Designator
ICE In-Circuit Emulator²⁴ [Intel] +
Integrated Computing Environment [Langley Research]
ICES Interference-Causing Equipment Standard
ICI Image Component²⁵ Information
ICL Interface Clear
ICLID Incoming-Call Line Identification
ICM Image Color Matching [Kodak] + Incoming Message
ICMP Internet Control Message Protocol [Novell]
.ICO Icon¹⁶ (file name extension)
iCOMP Intel Comparative Microprocessor²⁶ Performance [Intel]
ICP Image Coprocessor + Integrated Channel Processor
ICQ I Seek You (messaging program0
ICR Intelligent Character Recognition
ICS Intuitive Command Structure
ICSAPI Internet Connection Services API
ICU Instruction-Cache Unit +
Intel Configuration²⁷ Utility [Microsoft] +
ISA Configuration Utility
ID Identification + Identifier
IDA Integrated Digital Access + Intelligent Disk Array +
Intelligent Drive Array
IDAPI Integrated Database Application Programming Interface
IDC Integrated Database Connector +
Integrated Desk Connector +
Internet Database Connector [Microsoft]
IDDE Integrated Development & Debugging Environment [Symantec]
IDE Imbedded Drive Electronics +
Integrated Development Environment [Borland] +
Integrated Drive Electronics +
Intelligent Drive Electronics +
Interactive²⁸ Design and Engineering +
Interface Design Enhancement
IDEA International Data Encryption Algorithm
IDF Intermediate Distribution Frame
IDI Initial Domain²⁹ Identifier
IDIV Integer Divide
IDL Interactive Data Language +
Interface Definition Language
IDM Integrated document Management
IDMS Integrated Data Base Management System
IDNX Integrated Digital Network Exchange [IBM]
IDP Integrated Data Processing
IDR Intelligent document Recognition
IDT Interface Design Tool + Interrupt Descriptor Table
.IDX Index (file name extension)
IE Internet Explorer [Microsoft]
IEC International Electrotechnical Commission
IEEE Institute of Electrical and Electronics Engineers
IEF Information Engineering Facility
IEMSI Interactive Electronic Mail Standard
Identification
IEN Internet Engineering Notes
IETF Internet Engineering Task Force
IESG Internet Engineering Steering³⁰ Group
I/F Interface
IFC Internet Foundation Classes
IFD Image File Directory
IFF Interchangeable File Format [Amiga]
IFG Incoming Fax Gateway³¹
IFP Instruction Fetch Pipeline
IFS Installable File System
IFSM Information Systems Management
IGA Integrated Graphics Array
IGC Integrated Graphics Controller
IGES Initial Graphics Exchange Standard
IGFET Insulated-Gate Field Effect Transistor
IGMP Internet Group Multicast Protocol
IGP Interior Gateway Protocol
IGRP Interior Gateway Routing Protocol [Cisco]
IGS Internet Go Server
IHD Integrated Help Desk [IBM]
IHV Independent Hardware Vendor
IIF Immediate³² Interface
III Interstate Identification Index [NCIC]
IIOP Internet Inter-ORB Protocol
IIR Immediate Impulse Response
IIS Internet Information Server [Microsoft]
IITF Information Infrastructure³³ Task Force
IKP Internet Keyed Payments [IBM]
ILA Image Light Amplifier
ILE Integrated Language Environment [IBM]
ILP Instruction-Level Parallelism
ILS International Language Support
iMAC Internet Macintosh [Apple]
IMACS Image Management and Communication System
IMAP Internet Message Access Protocol
IMAX Maximum Image
IMDS Image Data Stream (format) [IBM]
IME Input Method Editor
IMG Image
IML Initial Microcode Load [IBM]
IMP Information/Interface Message Processor
IMPA Intelligent Multi-Port Adapter [DCA]
IMR Internet Monthly Report
IMS Information Management System +
Intermediate Maintenance Standards
IMSP Internet Message Support Protocol
IMTC International Multimedia³⁴ Teleconferencing Consortium
IMTV Interactive Multimedia Television
IMUL Integer Multiply
IMUX Inverse³⁵ Multiplexer
IN Input
INC Increment³⁶
.IND Index (file name extension)
.INF Information (file name extension)
.INFO Information Services (Domain Name) [Internet]
INFS Internet Network File System
.INI Initialize (file name extension)
INIT Initialization + Initialize
INM Integrated Network Management
INND Internet News Daemon
INS Input String + Integrated Network Server
INT Integer + Internal + Interrupt +
International (organization Domain name) [Internet]
INTA Interrupt Acknowledge
InterNIC Internet Network Information Center
INTO Interrupt if Overflow occurs
I2O Intelligent Input/Output
I/O Input/Output
IOC Inter-Office Channel
IOCC Input/Output Channel Converter +
Input/Output Controller Chip
IOCS Input/Output Control System
IOCTL Input/Output Control
IODE Integrated Development and Debugging
Environment [Symantec]
IOP Input/Output Processor
IOPL Input/Output Privilege Level
IOR Interoperable Object Reference
IOSGA Input/Output Support Gate Array
IP Instruction Pointer + Intellectual Property +
  Internet Protocol
IPBF Installed Peripheral Base Flexibility
IPC Instructions Per Clock + Interprocess Communication
IPCP Internet Protocol Control Protocol
IPCS Integrated PC Server
IPDS IBM Personal Dictation System [IBM] +
Intelligent Printer Data Stream [IBM]
IPFC Information Presentation Facility Compiler [IBM]
IPI Intelligent Peripheral Interface
IPL Initial Program Load/Loader +
Ion Projection Lithography
IPL * Information Programming Language
IPM Images Per Minute + Interpersonal Message
IPMI Intelligent Platform Management Interface
IPng Internet Protocol, next generation
IPP Internet Printing Protocol
IPSE Integrated Project Support Environment
IPTC International Press Telecommunications Council
IPX Internetwork Packet Exchange [Novell]
IQL Interactive Query Language
IR Infrared
IRC Internet Relay Chat
IRD Integrated Receiver/Descrambler
IRDA Infrared Data Association
IRDS Information Resource Dictionary System
IRET Interrupt Return
IRF Intermediate Routing Function +
Inheritance Rights Filter [Novell]
IRL Interactive Reader Language + Inter-Repeater Link
IRLAP Infrared Link Access Protocol
IRLED Infrared Light Emitting Diode
IRM Information Resource Management + Inherent Rights Mask
IRQ Interrupt Request
IRTF Internet Research Task Force
IRX Information Retrieval Experiment
IS Information System + Interrupt Status
ISA Industry Standard Architecture +
Instruction-Set Architecture
ISAM Indexed Sequential-Access Management/Method
ISAPI Internet Server API [Microsoft]
ISBN International Standard Book Number
ISC Instruction Set Computer + Inter-Systems
Communication [IBM]
ISD Image Section Descriptor +
Instructional Systems Design
ISDN Integrated Services Digital Network
ISH Information Super Highway
ISI Internally Specified Index
ISIS Integrated Systems and Information Services
ISKM Internet Starter Kit for the Macintosh
ISL Interactive System Language
ISM Integrated Services Model [IETF] +
Internet Service Manager [Microsoft]
ISMF Interactive Storage Management Facility
ISOC Internet Society
ISO International Organization for Standardization
ISP Internet Service Provider + Interrupt Stack Pointer +
Interrupt Status Port
ISPF Interactive System Programming Facility
ISR Information Storage and Retrieval +
Interrupt Service Routine +
Interrupt Status Register
ISSN International Standard Serial Number
ISV Independent Software Vendor
IT Information Technology
ITB Information Technology Branch + Intermediate Text Block
ITC International Typeface Corporation
ITE Information Technology Equipment
ITF Interactive Test Facility
ITN Identification Tasking and Networking
ITR Internet Talk Radio
ITU International Telecommunication Union
ITUG International Telecommunications User Group
ITU-TIES ITU-Telecom Information Exchange Services
ITU-TSS ITU-Telecommunication Standards Section
ITV Interactive Television
ITX Intermediate Text Block
IU Integer Unit
IUAP Internet User Account Provider
IUS/ITB Interchange Unit Separator/Intermediate Transmission
Block
IVDS Integrated Voice and Data Systems
IVIS Interactive Video Information System
IVL Independent Vendor League + 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 Interexchange Carrier

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