My parents got their visitor visa issued (@ Chennai Consulate) yesterday (such a big relief!). It seems the interview process took less than 5min for my parents. The questions asked were:
1. What's my big brother doing?
2. Where do I work?
3. Where do I live?
4. If my parents had applied for visa before?
5. When are they traveling to US?
That's about it! Looks like for the last questions (when are they traveling) the officer wrote something like sept. 1st week(unusual?).
The officer only looked at the employment verification sent by me. No additional documents were requested.
I got a lot of information from this group and especially from the website. Thank you all!