Dialogs are special windows that pop up over the active window. You generally see them when you select a menu item that ends in an ellipsis (...).
Dialogs can contain a number of standard Macintosh features (I call them dealie-boppers), such as radio buttons, pop-up menus, tabs, text-entry fields, and check boxes. You see these features again and again in dialogs. Take a moment to look at each of these dealie-boppers in Figure 2-5.
Radio buttons: Radio buttons are so named because, like the buttons on your car radio (if you have a very old car), only one at a time can be active. (When they’re active, they appear to be pushed in, just like the old radio buttons.) Radio buttons always appear in a group of two or more; when you select one, all the others are automatically deselected.
Here’s a nifty and undocumented shortcut: You can usually select check boxes and radio buttons by clicking their names (instead of the buttons or boxes).
Tabs: When a dialog contains more information than can fit in a single window the info may be divided among panes denoted by tabs. In Figure 2-5, the New Document tab is selected on the left, and the Open and Save tab is selected on ...