The dominating file sharing network FastTrack has a maximum of 4 million simultaneous users sharing up to 800 million files. In the middle of May there were a maximum of 5 million simultaneous users sharing up to 900 million files. In April the Recording Industry Association of America (RIAA) targeted individual music sharers with warnings and later with suits.

KaZaA Media Desktop (KMD), using the P2P network FastTrack, dominates strongly among file sharing clients. KMD connects to the FastTrack network together with the much smaller services iMesh and Grokster. Every week KMD is downloaded about 3 million times at Download.com. Internet users can share and download commercial music, movies, and programs using different file-sharing clients.