so they had long been a mac user, but the screenreader support started to slip around ~2014 so they actually switched back to windows because it was just a much better experience since apple who used to rock had dropped the ball. i tried to get him in touch with some cupertino people but we got snubbed, sadly.

anyway, it was IDA Pro, and they had spent some upfront time on tuning the layout to optimize their flow. I do not remember specifically but yes their IDA looked very different than the default setup.