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With his friends, Kan set up an information portal for Gnutella developers and helped write an early version of Gnutella for the Unix operating system.
With his partners he then devised a method of using Gnutella's file-sharing capabilities to create Infrasearch, a new type of search engine.
Former Netscape executives Marc Andreessen and Mike Homer backed the start-up company to develop the technology, which was later acquired by Sun Microsystems. Kan then joined Sun's peer-to-peer development team.