Is anyone out there familiar with the format of a vCalendar appointment? I need to send email notification to Outlook users from my app, and I would like them to be able to add it to their calendar by clicking or dragging.

Most specifically, I need to know the significance of the UID in the message. Is it a GUID for the appointment itself? How can I safely generate one in my app?

The rest of it looks pretty decipherable.

TIA
Michael