vCards
are contact details of each delegate. So, if a delegate wants to know
more about another delegate, he would send a vCard request. When another
delegate accepts the vCard requests, the requestee will be able to see
the contact details of the other delegate.
Meetings are
requests sent by one delegate to another delegate to setup a meeting
with him/her. Once a meeting request is sent, the another delegate, if
interested, would contact the delegate who requested the meeting.