Here’s a quick rundown of how usenet works: The three things required are a server, indexer, and downloaders. Server: Where you download the articles from. (Eweka, SuperNews) Indexer: A search engine for the usenet servers. (NZBGeek, NZBCat, DogNZB) Downloader: This is used to download and extract the files since they are put into RAR files. (NZBGet, SABnzbd) Arr software searches via the indexer which then sends the .