Most messages are replies to other messages, and thus an endless discussion is formed. Posting to a newsgroup is not unlike writing email. The Internet is the main medium for the distribution of Usenet News, but it wasn't always so. UUCP used to be the most common way to transfer Usenet, and it is still in use today. Getting a Usenet feed is as simple as asking an existing Usenet site.
Any site can feed or be fed by any other site, and thus it is practically impossible to control.
The protocol that was used by Usenet to transfer news and email between systems. It is still used to provide email access to some systems that do not have direct internet connectivity. Virus A virus is a small computer program that attaches itself to other programs. The only way to catch a virus is to run an infected program. When an infected program is run, the virus is also run, which allows the virus to replicate by attaching itself to other programs.