228 Glossarydrag — To hold down the TouchPad control button or mouse buttonwhile moving the cursor to drag a selected object. In theWindows ® operating system, this refers to the primary TouchPadcontrol button or left mouse button, unless otherwise stated.driver — See device driver.DVD — An individual digital versatile (or video) disc. See alsoDVD-ROM.DVD-ROM (digital versatile [or video] disc read-only memory)— A very high-capacity storage medium that uses laser optics forreading data. Each DVD-ROM can hold as much data as severalCD-ROMs. Compare CD-ROM.E emulation — A technique in which a device or program imitatesanother 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 executablefiles. Names of executable files usually end with a .bat or .exeextension.expansion device — A device that connects to a computer toexpand its capabilities. Other names for an expansion device areport expander, port replicator, docking station, or networkadapter.extension — See file extension.external device — See device.F file — A collection of related information, saved on disk with aunique name. A file may be a program, information used by aprogram, or a document. See also document.file allocation table (FAT) — The section of a disk that keeps trackof the location of files stored on the disk.file name — A set of characters that uniquely identifies a filewithin a particular folder. It consists of two parts: the actual nameand the file name extension. See also file extension.
