I have an Windows application that uses Documentum APIs to checkin/checkout documents into Documentum Content Server 6.5.1.
I use DFS 6.5.1 to interact with the server.
Now I need to logout of the session. How is that possible?
I don't understand your question, what do you mean by log out of the session.
You don't log out sessions, you release them to a session manager (if you are using one) or disconnect them directly.