Select a folder where unsaved documents should be temporarily stored.
If you hold down the Alt/Option key, you can open the folder in Explorer/Finder.
Saves all open documents under the previously used path or in the selected folder from #1.
If you're in a hurry, save and close all documents and quit Photoshop with one click.
A right-click on the buttons shows you all available functions so that you don't have to remember the keyboard shortcuts.