excel Dialog boxes

Some Ribbon commands display a dialog box. In many cases, these dialog boxes contain additional controls that aren’t available in the Ribbon.
You’ll find two general classes of dialog boxes in Excel:
h Modal dialog boxes: When a modal dialog box is displayed, it must be closed in order to
execute the commands. An example is the Format Cells dialog box. None of the options
you specify are executed until you click OK. Use the Cancel button to close the dialog
box without making any changes.
h Modeless dialog boxes: These are stay-on-top dialog boxes. For example, if you’re working with a chart using the Format dialog box, your changes are reflected immediately in
the chart. Modeless dialog boxes usually have a Close button rather than OK and Cancel
Many of Excel’s dialog boxes use a notebook tab metaphor, which makes a single dialog box function as several different dialog boxes. In older dialog boxes, the tabs are usually along the top. But
in newer dialog boxes (such as the one shown in Figure 2-11), the tabs are along the left side.