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People sitting in a hall with there smartphones when the speaker want the opinion of the public. They have to go to a site, where they see a screen with A, B, C, D. When someone push, for example B on that site, on a powerpoint sheet, a bar pushes forward. After a vote, the public must have a change to go to the new voting round.
So It is a live voting system.
So to summarise:
1. simple Mobile site with the vote buttons
2. Adminpage to manage evrey thing
3. Powerpoint integration with live voting bars
See also the attachments for more information.