In the context of BitTorrent, a refers to a peer that is currently downloading a torrent but has not yet completed the download. Leechers do not have a complete copy of the file and are still actively downloading pieces of the file from other peers.
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B3RAP (also known as B3 or BitTorrent RAP) seems to be related to the BitTorrent protocol, which is a popular method for distributing large files over the internet. B3RAP might refer to a specific tracker, a type of node, or a custom implementation related to BitTorrent.
