A Calendar Set Object manages a set of Calendars which can then be managed by the same calendar atom.
Calendar Set Object
Calendar Set Objects are useful for managing several Calendar Objects at once. A good use for this could be an office where everyone has a Calendar Object for themselves and then there is an office Calendar Set Object which manages everyone else's Calendar Objects.
Once you have created a Calendar Set Object select the Calendars tab and you will see this screen.
In this case there are no Calendar Objects associated to this Calendar Set. Once there is, any event that is associated to those Calendar Objects will show up in the Calendars tab. Clicking on any of the events will open them to be viewed or edited.
To link the Calendar Objects to the Calendar Set you must either create a new object as a child of the Calendar Set or associate an existing Calendar by the association child. For information on Associations please see the relevant help file.