Surveys on tables

At DAK Sunday we saw the usual survey-takers near the turnstiles, including some armed with the customary PDA-type electronic notebook and a stylus. But then we also came across a table set up with some laptop computers, possibly running a locked-down survey program (so you couldn't cruise around the open Internet). We didn't pause to take part, but it looks like they are offering to let folks take surveys by themselves, at their own pace, and without interacting verbally with the CM. Or maybe this was a special survey with a lot more questions?