Beyond the basic mechanics of flying in and sitting down the most challenging thing is the speed of the debate. You have to type your responses and try and follow what others are typing. When a large number of people are responding the small window screen can fill up quickly. This can make it very hectic in terms of following the line of the discussion and to see when it has changed or moved on. There are less visual clues compared to a real seminar the only clue you have is to see the gesture of typing by an Avatar and the sound of the typing. This alerts you to the fact that someone is about to respond. So you have to learn to be patient and the discussions have to be structured, especially if there is a finite amount of time available.