Glossary 229GHz — gigahertz — A measurement of frequency that equals one thousand millionHz, or one thousand MHz. The speeds for computer processors, buses, and interfacesare often measured in GHz.graphics mode — A video mode that can be defined as x horizontal pixels by y verticalpixels by z colors. Graphics modes can display an unlimited variety of shapes andfonts.GUI — graphical user interface — Software that interacts with the user by means ofmenus, windows, and icons. Most programs that operate on the Windows operatingsystems are GUIs.Hhard drive — A drive that reads and writes data on a hard disk. The terms hard driveand hard disk are often used interchangeably.heat sink — A metal plate on some processors that helps dissipate heat.hibernate mode — A power management mode that saves everything in memory to areserved space on the hard drive and then turns off the computer. When you restartthe computer, the memory information that was saved to the hard drive isautomatically restored.HTTP — hypertext transfer protocol — A protocol for exchanging files betweencomputers connected to the Internet.Hyper-Threading — Hyper-Threading is an Intel technology that can enhance overallcomputer performance by allowing one physical processor to function as two logicalprocessors, capable of performing certain tasks simultaneously.Hz — hertz — A unit of frequency measurement that equals 1 cycle per second.Computers and electronic devices are often measured in kilohertz (kHz), megahertz(MHz), gigahertz (GHz), or terahertz (THz).IIC — integrated circuit — A semiconductor wafer, or chip, on which thousands ormillions of tiny electronic components are fabricated for use in computer, audio, andvideo equipment.IDE — integrated device electronics — An interface for mass storage devices in whichthe controller is integrated into the hard drive or CD drive.IEEE 1394 — Institute of Electrical and Electronics Engineers, Inc. — A high-performance serial bus used to connect IEEE 1394-compatible devices, such as digitalcameras and DVD players, to the computer.
