Sometimes a Windows dialog shows the Apply button next to the OK and Cancel buttons. Some people are confused by what the Apply button does. I see them click the Apply button before clicking the OK button. They think that if they only click the OK button their changes will be lost.
When you click the Apply button the computer implements your changes AND leaves the dialog window open. This allows you to make further changes.
If you ignore the Apply button and click the OK button your changes are applied AND the dialog is closed.
Clicking the Cancel buttons reverts unapplied changes to their former state AND closes the dialog.
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