Action Center The pop-up pane that appears when you click Notifications in the Windows taskbar; it displays system messages and quick links to key Windows functions.

add-in board A device that plugs into a desktop computer’s system unit and provides auxiliary functions. (Also called a card.)

address The location of an Internet host. An email address might take the form; a web address might look like See also URL.

all-in-one computer A desktop computer in which the system unit, monitor, and speakers are housed in a single unit. Often the monitor of such a system has a touchscreen display.

app See application.

application A computer program designed for a specific task or use, such as word processing, ...

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