Most dialog boxes have an owner window (or more simply, an owner). When
creating the dialog box, the application sets the owner by specifying the owner's
window handle. Windows uses the owner to determine the position of the dialog box
in the Z order so that the dialog box is always positioned above its owner.
Also, Windows can send messages to the window procedure of the owner, notifying it
of events in the dialog box.
Windows automatically hides or destroys the dialog box whenever its owner is
hidden or destroyed. This means the dialog box procedure requires no special
processing to detect changes to the state of the owner window.
Because the typical dialog box is used in conjunction with a command in a
menu, the owner window is usually the window containing the menu. Although it is
possible to create a dialog box that has no owner, it is not recommended. For
example, when a modal dialog box has no owner, Windows does not disable any of the
application's other windows and allows the user to continue to carry out work
in the other windows, defeating the purpose of the modal dialog box.
When a modeless dialog box has no owner, Windows neither hides nor destroys
the dialog box when other windows in the application are hidden or destroyed.
Although this does not defeat the purpose of the modeless dialog box, it requires
that the application carry out special processing to ensure the dialog box is
hidden and destroyed at appropriate times.
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