Most of the interaction at is conducted on Web-based message boards. A message board allows you to post messages for others to read and to organize those messages into topics.
Message boards work similarly to newsgroups.
Each week, the instructor posts lessons and assignments, and you can connect to and read them anytime you wish. Members can also ask questions, make comments, or help others in the class by posting their own messages. Teaching assistants and other staff moderate the classroom so that you see only messages that are relevant to the topic. No flames, no spam. Just focused learning.