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accessory

One of the miniapplications that comes free with Windows XP. Examples include WordPad, Paint, and Calculator.

active window

The window you're currently using. You can tell a window is active by looking at its title bar: If the bar shows white letters on a dark background, the window is active. Inactive windows show light gray letters on a dark gray background.

application

Software that accomplishes a specific practical task. Same thing as a program.

application window

A window that contains a running application, such as Paint or WordPad.

ASCII text file

A file that uses only the American Standard Code for Information Interchange (ASCII) character set (techno-lingo for the characters you see on your keyboard).