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The blue, green, and red dots on the servers represent the groups they carry.Arrows between servers indicate newsgroup group exchanges (feeds).
This is largely because the POTS network was typically used for transfers, and phone charges were lower at night.
Or, talk.origins and talk.atheism are in the talk.* hierarchy.
When a user subscribes to a newsgroup, the news client software keeps track of which articles that user has read.
Today, one uses separate newsreader client software, a program that resembles an email client but accesses Usenet servers instead.
Some clients such as Mozilla Thunderbird and Outlook Express provide both abilities. A news server is one of the most difficult Internet services to administer because of the large amount of data involved, small customer base (compared to mainstream Internet services such as email and web access), and a disproportionately high volume of customer support incidents (frequently complaining of missing news articles that are not the ISP's fault).
Some ISPs outsource news operation to specialist sites, which will usually appear to a user as though the ISP ran the server itself.