DSG provides a lot of functionality for interaction among students and instructors.
Every Course taker is added to the course group. There are many useful plugins which can be installed to increase the usability of Groups in LMS. The plugin Group documents enables the Instructor to upload documents, like assignments for the Course group. This is automatically sent to the full course group.
With the forum WPLMS get a lot of interaction features. A Private forum conencted to the Group can be made as the Course forum. This makes the Forum an exclusive club for the Course Members.