Hi, thanks to all of you. I am impressed how many of you responded and how constructive your comments are. You really care about Gretl! Your answers showed me that this program will have a future. So I will throw myself into it. Can I be of any help to improve Gretl? My C knowledge is frankly very limited. At the moment, I can of course report possible bugs. Anything else I can do? Thanks again and kind regards, Thorsten