From the site:
The Question and Answer Tool is for classes, presentations, panels, and other public discussions. Project it on a wall and advertise the URL to all attendees. Users can post questions to be included by a moderator, teacher, or panel member.
This tool was originally developed by The Berkman Center for Internet & Society. From their website: Berkman Question Tool now available on Sourceforge
The Berkman Center for Internet & Society developed, a few years ago, the Question Tool — an organized backchannel for conferences and classes that allows participants to submit, answer, and vote on questions. It’s an effective way to keep feedback focused, direct speakers to audience interests, and potentially prevent the mic from being hijacked by that weirdo.