HA - High Availability
HAC - Hershey Apple Core
HACMP - High-Availability Cluster MultiProcessing
HAD - High-Availability Daemon
HAL - Hardware Abstraction Layer
HAL - HTML Auto Layout
HALO - High Altitude Long Operation
HAM - Host Adapter Module
HAN - High-Availability Network
HANFS - Highly-Available Network File System
HARP - Hardware Architecture Reference Platform
HARP - Home Audio Reference Platform
HASP - Hardware Against Software Piracy
HATS - Host Access Transformation Server
HAVi - Home Audio Video interoperability
HAWK - Hostile Activity Watch Kernel
HB - Host Bridge
HBA - Host Bus Adapter
HCA - Host Channel Adapter
HCC - Host Control Component
HCD - Host Controller Driver
HCI - Host Controller Interface
HCI - Human-Computer Interaction
HCL - Hardware Compatibility List
HCS - Harvard Computer Society
HCT - Hardware Compatibility Tests
HCTS - Hardware Certification Test Suite
HD - Hard Disk
HD - High Definition
HD - High Density
HDA - Head Disk Assembly
HDAG - Hierarchical Directed Acyclic Graph
HDAM - Hierarchical Direct Access Method
HDCD - High-Definition Compatible Digital
HDCP - High-bandwidth Digital Content Protection
HDD - Hard Disk Drive
HDF - Hierarchical Data Format
HDF - Horrible Document Format
HDK - Hardware Development Kit
HDL - Hardware Description Language
HDLC - High-level Data Link Control
HDM - Hardware Device Module
HDM - Heuristic Data Mining
HDMI - High-Definition Multimedia Interface
HDML - Handheld Device Markup Language
HDR - Hard Disk Recorder
HDRM - High-Density Rack-Mount
HDS - Hitachi Data Systems
HDSL - High bitrate Digital Subscriber Line
HDSL - High datarate Digital Subscriber Line
HDT - Host Digital Terminal
HDTP - Handheld Device Transfer Protocol
HDVP - High-Definition Video Processor
HEC - Header Error Control
HECRTF - High-End Computing Revitalization Task Force
HEPNET - High-Energy Physics Network
HERT - Hacker Emergency Response Team
HFC - Hybrid Fiber/Coaxial
HFMC - HotFax MessageCenter
HFS - Hierarchical File System
HFS - HotFax Share
HGML - Hyper Graphics Markup Language
HI - Hub Interface
HID - Human Interface Device
HIDAM - Hierarchical Indexed Direct Access Method
HIDS - Host-based Intrusion Detection System
HIIPA - High Impedance Integrated Power Amplifier
HIP - Hardware Instrumentation Package
HIP - HSSI Interface Processor
HIP - Human Interactive Proof
HIPERLAN - HIgh-PERformance Local Area Network
HIPPI - High-Performance Parallel Interface
HIPS - Host-based Intrusion Prevention System
HIS - Hospital Information System
HIS - Host Integration Server
HKCS - Hong Kong Computer Society
HKISPA - Hong Kong Internet Service Providers Association
HKMUG - Hong Kong Macintosh User Group
HKSCS - Hong Kong Supplementary Character Set
HLL - High-Level Language
HLLAPI - High-Level Language Application Programming Interface
HLR - Home Location Register
HLS - High-Level Synthesis
HLSL - High-Level Shading Language
HMA - High Memory Area
HMAC - Hash-based Message Authentication Mode
HMC - Hardware Management Console
HMC - Hosted Messaging & Collaboration
HMD - Head-Mounted Display
HMI - HTML Mail Interface
HMP - Host Media Processing
HMP - Host Monitoring Protocol
HOD - Host On-Demand
HOLAP - Hybrid OnLine Analytical Processing
HON - Health On the Net
HOOD - Hierarchical Object-Oriented Design
HP - Hewlett-Packard
HP-PB - Hewlett-Packard Precision Bus
HP-UX - Hewlett-Packard UNIX®
HPBGA - High-Performance Ball Grid Array