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The later peer-to-peer networks operate on a similar principle, but for Usenet it is normally the sender, rather than the receiver, who initiates transfers.
Usenet was designed under conditions when networks were much slower and not always available.
It was originally built on the "poor man's ARPANET", employing UUCP as its transport protocol to offer mail and file transfers, as well as announcements through the newly developed news software such as A News.
In early news implementations, the server and newsreader were a single program suite, running on the same system.
Tom Truscott and Jim Ellis conceived the idea in 1979, and it was established in 1980.
Users read and post messages (called articles or posts, and collectively termed news) to one or more categories, known as newsgroups.
Arrows between clients and servers indicate that a user is subscribed to a certain group and reads or submits articles.) is a worldwide distributed discussion system available on computers.
It was developed from the general-purpose UUCP dial-up network architecture.