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CPU—See Central Processing Unit (CPU). Glossary Glossary CPU cache—A section of very fast memory residing between the CPU and the computer’s main memory that temporarily stores data and instructions the CPU will need to execute commands and programs. See also cache, L1 cache, L2 cache. cursor—An on-screen symbol (usually a flashing vertical line) that indicates the position where characters will appear when you enter data. D default—The setting selected by a program when the user does not specify an alternative setting. device—A component attached to the computer. Devices may be external (outside the computer’s case) or internal (inside the computer’s case). Printers, disk drives, and modems are examples of devices. device driver—A program (called a “driver”) that permits a computer to communicate with a device. dialog box—An on-screen window displayed by the operating system or a program giving a direction or requesting input from the user. Direct Current (DC)—The type of power usually supplied by batteries. DC flows in one direction. Compare Alternating Current (AC). Direct Memory Access (DMA)—A dedicated channel, bypassing the CPU, that enables direct data transfer between memory and a device. directory—See folder. disable—To turn a computer option off. See also enable. disc—A round, flat piece of material, designed to be read from and written to by optical (laser) technology, and used in the production of optical discs, such as CDs and DVDs. Compare disk. disk—A round, flat piece of material that can be magnetically influenced to hold information in digital form, and used in the production of magnetic disks, such as hard disks. Compare disc. See also hard disk. disk drive—The device that reads and writes information and programs on external media or hard disk. It rotates the disk at high speed past one or more read/write heads. Glossary Glossary document—Any file created with an application and, if saved to disk, given a name by which it can be retrieved. See also file. double-click—To press and release the pointing device’s primary button rapidly twice without moving the pointing device. In the Windows® operating system, this refers to the pointing device’s left button, unless otherwise stated. download—(1) In communications, to receive a file from another computer through a modem or network. (2) To send font data from the computer to a printer. See also upload. drag—To hold down the mouse button while moving the pointer to drag a selected object. In the Windows® operating system, this refers to the left mouse button, unless otherwise stated. driver—See device driver. DVD—An individual digital versatile (or video) disc. See also DVD-ROM. DVD-ROM (Digital Versatile [or Video] Disc Read-Only Memory)—A very high-capacity storage medium that uses laser optics for reading data. Each DVD-ROM can hold as much data as several CD-ROMs. Compare CD-ROM. E emulation—A technique in which a device or program imitates another device or pr...

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