For part of my project I'm adding a grouping ability for events. I've created a secondary calendar that I can edit through java and my plan is to add a custom field on my default calendar for the events that I want to be grouped. In that field I want to store the ID of a 'group' event in the second calendar which can then be used to retrieve the 'group' event and mess around with it.

My question is, does the ID of an event change from session to session? It seems to change when an event is deleted and reinserted but does it also change when it is updated? Is it possible for me to retrieve an event based solely on its ID or do I have to have some kind of session ID too? If I can access the secondary calendar then I can get that session ID can't I?

Regards,