While practicing Vipassana, are there people who have become sotāpanna [i.e. who reached the goal of nibbāna] without realizing it? Are there changes in those who have managed to reach the sankhāra-upekkhā level [a stage leading to the experience of nibbāna]?

Goenkaji’s answer addresses lot many other queries that keep arising in people’s mind about the Buddha’s teaching even if the question may not be directly connected with it. Take a listen..
Also, this video like other one, is an excerpt from the content on dhammavani’s Live Radio-IST. The entire question & answer can be heard in the Evening Dhamma Discourse. check timing on http://www.dhammavani.org