A
active window

The topmost window; the window that is currently receiving mouse and keyboard input. Pre–Mac OS X, that window can be identified by the horizontal lines in its title bar.

ADB Apple Desktop Bus.
See [Apple Desktop Bus]
AGP

Accelerated Graphics Port, the slot for a video card on newer Macs.

AIFF

Audio Interchange File Format, the standard sound format on the Mac.

AirPort

Apple's wireless networking technology. There are AirPort cards, which fit into Macs, and AirPort Base Stations, which communicate with the cards.

alert box

A box that appears when the user is about to do something dangerous or if something has gone wrong.

alias

A file that points to another item, such as a file, folder, or application. When you double-click an alias, ...

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