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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 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. motherboard — The main circuit board in the computer. It 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 N connected by communications facilities. A network allows you to share data and peripheral devices, such as printers, with other users and to exchange electronic mail. non-interlaced — A method of refreshing a computer screen, in which each pixel of every line is refreshed as the electron beam scans across and down the screen. Compare interlaced. Glossary 265 non-system disk — A disk for storing programs and data that cannot be used to start the computer. Compare system disk. online — Available through the computer. Online may refer to O information being read from your own computer’s hard disk, such as online documentation or online help, or to information coming from another company on a company network or the Internet. operating system — A set of programs that controls how the computer works. Examples of operating systems are Windows® XP and Windows® 2000. palette — See color palette. P parallel — Processes that occur simultaneously. In communications, it means the transmission of more than one bit of information at a time. On your computer, the parallel port provides a parallel communications interface between the computer and an appropriate device. Most modern printers are parallel. Compare serial. password — A unique string of characters entered by a user to verify his or her identity to the computer or the network. PC Card — A credit-card-sized expansion card designed to increase the capabilities of notebook computers. PC Cards provide functions such as modem, fax/modem, hard disk drive, network adapter, sound card, or SCSI adapter. peripheral — Any device, such as a printer or joystick, that is attached to the computer and controlled by the computer’s CPU. pixel — Short for “picture element.” The smallest dot that c...

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