A closed adoption is where the files are closed. And there is no contact. An open adoption there is contact with the birthmother. My sister adopted two girls. Both were open. The birthmothers recieved pictures of the girls as they grew up.

if the case is closed can you still get information about the children

If you are adopting, you can choose whether you want a closed or open adoption, and it can always be changed later too. My 4 year old's adoption is closed, although she still maintains contact with her grandparens, sisters and extended relatives. My 3 1/2's adoption is open. She still maintains contact with all family on my discretion. We are going to mediation to write the terms of the conditions but I have been told that if it becomes more of an issue that can be stopped as well. If you have any questions or concerns you should speak to your adoption agency, or caseworker if you have one.