U.S visa b1/b2 application in chennai

Hello My parents, (Indian nationals) are scheduled for Biometric and consulate interview for B1/B2 visa. I understand 2 days we have to spend in chennai. Appreciate if some one can explain the complete procedures for day1 & Day2 .

1st day would be VFS… Just biometrics and photo (they click a pic)… Passport, DS160 confirmation and B1 docs needed…

2nd day would be interview