It is not an open source code. If you want to see it go to Marks site. It is reasonable so I bought it. Mark has a group at Yahoo that you could join to get a lot of info. I find JMA to be of limited value over T3 average or the like that are free open source code but that is just me. I do use some of his indicators and functions while day trading. I have found Mark to be helpful in every way when I had a question or issue.