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operating system—A set of programs that controls how the computer works. Examples of operating systems are the Windows Vista® Home Basic and Windows® 7 operating systems. optical disc drive—A drive which reads plastic coated discs on which information is recorded digitally, and uses a laser to read data, music, or videos. palette—See color palette. 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. Glossary Glossary 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 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 can be produced on a screen or printer. Plug and Play—Generally, refers to the computer’s ability to automatically configure itself to work with peripheral devices. When capitalized, refers to a standard that, when followed by a device manufacturer, allows a computer to configure itself automatically to work with the device. pointer—An icon (usually an arrow) that moves on the screen when you slide your finger across the touch pad or move a mouse. Used to point to and select/activate on-screen items, such as icons, menu items, and buttons. The shape and purpose of the pointer varies depending on the program you are using and what you are doing. pointing device—Any device, such as the touch pad or a mouse, that enables you to move the pointer on the screen. port—A socket on the computer where you plug in a cable for connection to a network or a peripheral device. processor—See Central Processing Unit (CPU). program—A set of instructions that can be executed by a computer. The general classes of programs (also called software) are operating system, application, and utility. See also operating system, application, utility. properties—The attributes of an object or device. For example, the properties of a file include the file’s type, size, and creation date. R RAM (Random Access Memory)—Volatile memory that can be written to as well as read. Volatile here means that information in RAM is lost when you turn off your computer. This type of memory is used for your computer’s main memory. See also memory. Compare ROM. Glossary Glossary Random Access Memory—See RAM. Read-Only Memory—See ROM. reboot—See boot, restart. removable disk—A disk that can be removed...

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