I think you will have a very hard time finding it.
What you're asking for is for a program to steal focus, which is generally considered evil. Pure evil. Evil as in the Devil would shun it.
I can see the point to it, but really, I think you're going to need some luck in finding it.
If you have some code handy for someone, or if you have some VERY specific format ready that can be implemented quickly, then I think you can see if someone will build it for you.
The basics for it aren't very hard. It is however... esoteric.
If you know XML, that would be very good. XML is very easy to create and consume, so it would be an ideal format to contain the questions/answers.
Don't expect anyone to input data for you, but that's a good study exercise, so it shouldn't be a deal breaker.
(I'm interested, so do post back. I may be able to help out, but no promises.)