This is an on-line discussion forum called Walter CS Classes discussions.
Always start the subject of your message with the class that you attend. ie.
CS140U - Cool site for learning vi
The contents frame shows the titles of all articles posted to the discussion. Selecting a title will cause the corresponding article to be loaded into this frame.
You may also:
In addition, each article has links to let you reply to it (continue the thread) and navigate the article list.