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controller — A device that controls the transfer of data from a computer to a peripheral device and vice versa. For example, disk drives, monitors, keyboards, and printers all require controllers. CPU — See central processing unit (CPU). 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 — A symbol that indicates the current position on the screen. The shape of the cursor varies, depending on the program you’re using and what you’re doing. default — The setting selected by a program when the user does D 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). Glossary 251 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 metal, 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 diskettes and hard disks. Compare disc. See also diskette, hard disk. disk drive — The device that reads and writes information and programs on a diskette or hard disk. It rotates the disk at high speed past one or more read/write heads. diskette — A thin, flexible disk in a protective jacket that stores magnetically encoded data. Diskettes can be removed from the computer. Your computer uses 3.5-inch diskettes. 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 the control button or mouse button rapidly twice without moving the cursor with the TouchPad or mouse. In the operating system, this refers to the primary control button or left mouse 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 control button or mouse button while moving the cursor to drag a selected object. In the operating system, this refers to the primary control button or left mouse button, unless otherwise stated. driver — See device driver. Glossary 252 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. emulation — A technique in which a device or program imitates E another device or program. enable — To turn on a computer option. See also disable. executable file — A computer program that is ready to run. Application programs and batch files are examples of executable files. Names of executable files usually end with a .bat or .exe extension. expansion device — A device that connects to a computer to expand its capabilities. Other names for an expansion device are port expander, port replicator, docking station, or network adapter. extension — See file extension. external device — See device. file — A collection of related information, saved on disk with a F unique name. A file may be a program, information used by a program, or a document. See also document. file allocation table (FAT) — The section of a disk that keeps track of the location of files stored on the disk. file name — A set of characters that uniquely identifies a file within a particular folder. It consists of two parts: the actual name and the file name extension. See also file extension. file extension — The three characters following the period (pronounced “dot”) at the end of a file name. The extension indicates the type of file. Examples are .exe for program files and .hlp for help files. See also file name. Glossary 253 folder — Also called directory. A container for organizing files saved to a disk. A folder is symbolized on screen by a graphical image (icon) of a file folder. A folder can contain files and other folders. format — (verb) To prepare a blank disk for use with the computer’s operating system. Forma...

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