H/E Headend HALE High-Altitude Long-Endurance HAN Home Area Network HASP Houston Automatic Spooling Program HDL Hardware Dewcription Language HDLC High-Level Data Link Control HDPE High-Density Polyethylene HDR High Data Rate HDSL High bit rate Digital Subscriber Line HDT Host Digital Terminal HDTV High Definition TeleVision HEC Header Error Control (ATM) HFC Hybrid Fiber/Coax HIPERLAN High-Performance Radio Local Area Network HIPPI High-Performance Parallel Interface HL7 Health Level 7 HLR Home Location Register (GSM) HMD Head Mounted Display HMR High-speed Multimedia Ring HPA High Power Amplifier HPB HDSL Payload Block HPC High Performance Computing HPCC High Performance Computing and Communications HRRC Home Recording Rights Coalition HSCSD High-Speed Circuit Switched Data (GSM) HSDPA High-Speed Downlink Packet Access (UMTS) HSSI High-Speed Serial Interface HSUPA High-Speed Uplink Packet Access (UMTS) HTML HyperText Markup Language (Internet) HTTP HyperText Transport Protocol (Internet) HTU HDSL Transceiver Unit