er</b> paved the way, but the most popular file-swapping software of all time is <b>KaZaA</b>, which this year overthrows <b>Dragonball</b> to stand as the number one search term of 2003 with Web users.
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Since Napster was introduced in 2000, there have been a succession of file-swapping software programs.  At all times, there was always one program that dominated the others in searches.  First it was Napster, which ended as the #3 term of 2001.  When the government took