Answer / guest

Occurs before a form or application closes. When an MDIForm
object closes, the QueryUnload event occurs first for the
MDI form and then in all MDI child forms. If no form
cancels the QueryUnload event, the Unload event occurs
first in all other forms and then in an MDI form.
When a child form or a Form object closes, the QueryUnload
event in that form occurs before the form's Unload event.

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