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See also reboot. Glossary Glossary bus—An electrical circuit that connects the central processing unit (CPU) with other parts of the tablet, such as the video adapter, disk drives, and ports. It is the pathway through which data flows from one device to another. See also bus speed, frontside bus. bus speed—The speed at which the central processing unit (CPU) communicates with the other parts of the tablet. cache—A section of very fast memory in which frequently used information is duplicated for quick access. Accessing data from cache is faster than accessing it from the tablet’s main memory. See also CPU cache. Central Processing Unit (CPU)—The chip that functions as the “brain” of the tablet. It takes information from outside sources, such as memory or keyboard input, processes the information, and sends the results to another device that uses the information. character—Any letter, number, or symbol you can use on the tablet. Some characters are non-printing characters, such as a paragraph break in a word-processing program. A character occupies one byte of tablet device storage. chip—A small piece of silicon containing tablet device logic and circuits for processing, memory, input/output, and/or control functions. Chips are mounted on printed circuit boards. compatibility—The extent to which tablets, 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 tablet operating system. (2) How parts of the system are set up (that is, configured). controller—A device that controls the transfer of data from a tablet device 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 tablet’s main memory that temporarily stores data and instructions the CPU will need to execute commands and programs. See also cache. Glossary 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 tablet. Devices may be external (outside the tablet’s case) or internal (inside the tablet’s case). Printers, disk drives, and modems are examples of devices. device driver—A program (called a “driver”) that permits the tablet to communicate with a device. Direct Current (DC)—The type of power usually supplied by batteries. DC flows in one direction. Compare Alternating Current (AC). disable—To turn the option off. See also enable. 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. document—Any file created with an application and, if saved to disk, given a name by which it can be retrieved. See also file. download—(1) In communications, to receive a file from another source through a network. (2) To send font data from the tablet to a printer. See also upload. drag—To touch and hold an item for a moment and then, without lifting your finger, move the item until you reach the target position. driver—See device driver. E emulation—A technique in which a device or program imitates another device or program. enable—To turn on an option. See also disable. executable file—A 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, .exe, or .apk extension. expansion device—A device that connects to a tablet to expand its capabilities. Other names for an expansion device are port expander, port replicator, docking station, or network adapter. Glossary Glossary F G H extension—See file extension. external device—See device. file—A collection of related information, saved on disk with a unique name. A file may be a program, information used by a program, or a document. See also document. 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 .apk for application files and .pdf for documentation files. See also file name. folder—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. ground—A conductor to which all components of an electric circuit are connected. It has a potential of zero (0) volts, is connected to the earth, and is the point of reference for voltages in the circuit. hard disk—A storage device composed of...
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