If I have several forms on Forms Central can I assign a different user name and password to each one so that a person can only see their form?
If your goal is to have one form per person that they would "co-author" and have access to see the responses for the form, then each user would have a FormsCentral account (could be a Free account) and you would "Share" the form with the user assigning them as a Co-author. When they log in they would see that form but the other people who you shared different forms with would not see that persons form. The instructions for how to share a form are here: http://forums.adobe.com/docs/DOC-2462
Does that answer your question?
thanks for the help - I will give that a try.