Can someone plz clarify on this this suddenly came to my mind.
Take for example a site has 10 pages in all. The webmaster creates a sub domain for each page so that the users are can easily remember the url of the pages like
www.domain.com/forum === forum.domain.com
www.domain.com/chat...
Hi Guest we just wanted to alert you to a major change in the forum. We will no longer be allowing the posting of outgoing links. Please use the attachment feature to attach media to your posts.