When you subscribe to an iCal, the events that you see in the calendar are updated whenever the owner of the iCal makes changes, so that you always have an up-to-date version of the iCal.
Ko se naročite na koledar iCal, so dogodki, ki jih vidite v koledarju, posodobljeni vsakič, ko lastnik koledarja iCal naredi spremembe, tako da imate vedno posodobljeno različico koledarja iCal.