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Controls, Dialog Boxes, and Message Boxes
An application uses several types of windows in addition to its main window,
including controls, dialog boxes, and message boxes.
A control is a window that an application uses to obtain a specific piece of
information from the user, such as the name of a file to open or the desired point size
of a text selection. Applications also use controls to obtain information needed
to control a particular feature of an application. For example, a
word-processing application typically provides a control to let the user turn wordwrapping
on and off. For more information about controls, see Controls.
Controls are always used in conjunction with another window  typically, a dialog box. A dialog box is a window that contains one or more controls. An application uses a dialog
box to prompt the user for input needed to complete a command. For example, an
application that includes a command to open a file would display a dialog box
that includes controls in which the user specifies a path and filename.
A message box is a window that displays a note, caution, or warning to the user. For
example, a message box can inform the user of a problem the application has
encountered while performing a task.
Dialog boxes and message boxes do not typically use the same set of window
components as does a main window. Most have a title bar, a window menu, a border
(nonsizing), and a client area, but they typically do not have a menu bar,
minimize and maximize buttons, or scroll bars. For more information about dialog
boxes and message boxes, see Dialog Boxes.
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