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See also cache, CPU cache, L2 cache. L2 (level two) cache — Memory cache installed on the motherboard to help improve processing speed. It is slower than L1 cache and faster than main memory. See also cache, CPU cache, L1 cache. Glossary 215 LAN (Local Area Network) — A group of computers or other devices dispersed over a relatively limited area and connected by a communications link that enables any device to interact with any other on the network. LED (Light Emitting Diode) — A solid state lamp (SSL) that uses light-emitting diodes (LEDs) as the source of light, which offers long life and high efficiency output. Multiple diodes are used together, since the light created by individual light-emitting diodes is small compared to incandescent and compact fluorescent lamps. LCD (Liquid Crystal Display) — A type of display that uses a liquid substance between two transparent electrode panels. When an electric current passes through the electrodes, the molecules in the liquid form a crystalline pattern that polarizes the light passing through it. A filter over the electrodes permits only non-polarized light to pass to the surface of the display, creating light and dark pixels. load — To move information from a storage device (such as a hard disk) into memory for processing. local area network — See LAN. logical drive — A section of a disk that is recognized by the operating system as a separate disk drive. A system’s logical drives may differ from its physical drives. For example, a single hard disk drive may be partitioned into two or more logical drives. M memory — Typically refers to the computer’s main memory, where programs are run and data is temporarily stored and processed. Memory can be volatile and hold data temporarily, such as RAM, or it can be nonvolatile and hold data permanently, such as ROM. A computer’s main memory is RAM. See also RAM, ROM. microprocessor — See Central Processing Unit (CPU). MIDI (Musical Instrument Digital Interface) — A standard for connecting musical instruments, synthesizers, and computers. The MIDI standard provides a way of translating music into a form computers can use, and vice versa. modem — Short for “modulator/demodulator.” A device that converts information from digital to analog, and back to digital, enabling information to pass back and forth between digital computers and analog telephone lines. Glossary 216 N O P motherboard — The computer’s main circuit board that contains the processor, memory, and other primary components. MS-DOS prompt — See system prompt. multi-function drive — A DVD drive that can read and write to CD and DVD media. multimedia — A combination of two or more media, such as sound, animation, and video in a computer program or presentation. Musical Instrument Digital Interface — See MIDI. network — A collection of computers and associated devices that are connected by communications facilities. A network allows you to share data...

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