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FSP was an anonymous-FTP replacement popular during the mid-1990s. By using UDP for the underlying transport rather than TCP, a FSP server could scale to many more clients than an FTP server.During the mid-1990s, FSP servers were popular among hackers. They would break into somebody's machine, then install a FSP server to exchange files (e.g. (/Underground/Warez$warex$) with their friends.
In addition, FSP includes traffic-shaping features, and forbade clients from downloading files to fast. By forcing everyone to download files somewhat slowly, it could support many more simultaneous clients.