I have created a patient registry and follow-up file. I have to use the same file in my private office with 2 computers, in my hospital with 2 computers, at home with two computers. Should I purchase a licence for every computers? If it is the case, FileMaker is a very expensive solution for this purpose. So far, I have been using Access program. Since it can not be used in Mac, I want to switch to FileMaker.