HyperNews is a cross between the hypermedia of the WWW and Usenet News. Readers can browse through the messages written by other people and reply to those messages. A forum (also called a base article) holds a tree of these messages, displayed as an indented outline that shows how the messages are related (i.e. all replies to a message are listed under it and indented). Users can become members of HyperNews or subscribe to a forum in order to get email whenever a message is posted, so they don't have to check if anything new has been added. A recipient can then send a reply email back to HyperNews, rather than finding a browser to write a reply, and HyperNews then places the message in the appropriate forum.