Suggestions

URL Structure

/ : login screen or create new Professor account.
/:user : home screen for account. List all presentations, upload new ones
/:user/admin/:presentation : display and control a presentation when it is broadcast.
/:user/stats/:presentation : display stats about current presentation. Nb of viewers, audience participation, ...
/:user/live/:presentation : display and follow the presentation, answer questions as they come.
/:user/edit/:presentation : questions editor for the presentation