Categories are used just like standard Joomla! categories to assist you group the stages. With categories you can control for each category the access level and user rules.
The SP Staging Manager is the place in the back-end where you can add and manage all of the stages you want to control. From the stages view you can do the follow tasks:
This view is like the well known core Extensions Update view, with the big difference that you can see find updates for all the stages, and update all at once.
From this view you can do the follow:
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