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Alerts, which are common on any operating system and in most applications, are similar to dialog boxes in that they’re small windows that contain information. However, alerts are different from dialog boxes because you can’t edit the information in them. Alerts are designed simply to tell you something and give you one or more options that you select by clicking a button. For example, an alert may indicate that you can’t select a particular option. Usually you see an OK button to click to acknowledge and close the alert. You may see other buttons on the alert, such as a button to cancel what you were doing or one that opens a dialog box. Figure 4-3 shows a typical alert.

FIGURE 4-3: A simple choice: OK or cancel.

You can sometimes use an alert to confirm an action before executing it. Sometimes an alert window also offers the option (typically in the form of a checkbox) of not showing the alert or warning again. You may want to select this option if you repeatedly perform an action that shows the warning and you don’t need to see the warning every time.