Toshiba Satellite M645-S4070 User Guide - Page 231

231 Glossary 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 a hard disk. It rotates the disk at high speed past one or more read/write heads. document - Any file created with an application and, if saved to disk, given a name by which it can be retrieved. See also file.