Figure 2-10:

An example of buttons
If your hands happen to be on the keyboard rather than the mouse and you want to choose a button,
you can press the Tab key to move forward from one control to the next, or you can press Shift+Tab to
move backward through the controls until the button you want to press is highlighted with a dotted line.
Then press Enter to push that highlighted button.
The buttons play an important role in dialog boxes. Keeping them straight is important. Remember
these important points:
The Apply button (if available and enabled) applies your selection right now, without closing
the dialog box.
The OK button applies your selection(s) and then closes the dialog box.
The Cancel button (or pressing the Esc key) closes the dialog box without applying or
saving any options you selected. However, it does not undo any selections you have
already applied!
Any button that appears to be dim is currently disabled, and clicking it will do you no good.
The button will become enabled again once it can serve some purpose. For example, the
Apply button will be enabled only after you make some selection that you can apply.
Don’t forget the handy Help (?) button displayed near the top of many dialog boxes. You can click this
button and then click any option within the dialog box to learn more about that option.