>> Everybody talks at once.
>
>This is a good point. I will start asking presenters how they would like to handle questions. Perhaps we can work on a Q/A etiquette. Something like...
>
>Type "Q" if you want to ask a question. When the presenter or host address you with "Go ahead "Mr/Ms X", ask your question.
>

Too formal, and takes too much time. During my lectures, I like to break and ask if everybody's keeping up, or if anybody has questions. I would prefer that people not ask questions until the presenter (me) has opened the floor for questions. It should be up to the presenter to decide how often to do this.
After the floow is open, it should be sufficient for the attendee to state:

"How do we ..."

and the presenter to address the question with :

"EM- you do it like..."

where EM are the initials of the asker.