iOS App to ask and answer questions about a specific topic

I'm looking for an iPad iOS app that allows each user to submit questions in the app using their iPad.
These questions should be sent to something like the "host" iPad/PC/whatever to be answered within the application.
The app should also support the typical API to be used with a projector. That's because I want to project the question and its answer on a screen using the host device.

The use-case will be at a keynote where two people will train 10-20 people. While one guy is presenting the other one could answer questions the pupils submitted.

If somebody has an idea, I'd appreciate your input!

Thanks

biosci said:

I'm looking for the same thing! Been searching for the past couple of days.

Click to expand...

Hope we'll find something with combined power^^
I already looked into Google Moderator but it forces you to create a Google account, which is a no-go for presentations.