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character — Any letter, number, or symbol you can use on the computer. Some characters are non-printing characters, such as a paragraph break in a word-processing program. A character occupies one byte of computer storage. chip — A small piece of silicon containing computer logic and circuits for processing, memory, input/output, and/or control functions. Chips are mounted on printed circuit boards. click — To press and release the pointing device’s primary button without moving the pointing device. In the Windows® operating system, this refers to the pointing device’s left button, unless otherwise stated. See also double-click. color palette — A set of specified colors that establishes the colors that can be displayed on the screen at a particular time. compatibility — The extent to which computers, programs, or devices can work together harmoniously, using the same commands, formats, or language as another. configuration — (1) The collection of components that make up a single computer system. (2) How parts of the system are set up (that is, configured). 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 are using and what you are doing. D default — The setting selected by a program when the user does not specify an alternative setting. Glossary 230 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 for...

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