I am building a customer questionnaire for our existing customers and, on the first page, have fields to type in the customer name and number (a unique number we assign to each customer.)
I would prefer to specify these myself when I send out the questionairre in case the customer doesn't know their customer number. Theoretically, this would work with a query string or something similar so that each customer would get a unique URL to the form (i.e. formcentral.acrobat.com/myquestionnaire.html?custId=1234).
I'm intending to track and graph all of my results and don't want multiple submissions from the same customer to skew the findings. I'm also setting up some mecahnisms to get back in touch with customers who fill out the questionnaire and answer any questions or concerns they expressed with it, which I obviously wouldn't be able to do if they didn't specify adequate identifying informaiton.
Currently we do not have a feature that allows you pre-fill in customer response data, or a way to prevent multiple submissions. Preventing multiple submissions is something that is requested frequently, and we are looking at for a future release. We do look to the ideas section to help guide us on what features we work on next. I suggest you add your idea about pre-filling in customer resposne data to the ideas section, and also voting for the preventing of multiple responses idea.