On March 14, 2000, Frankel and Nullsoft colleague Tom Pepper released "gnutella", a public peer-to-peer file-sharing application, using Nullsoft's corporate web servers, without AOL's knowledge. Gnutella was a new peer-to-peer file-sharing system like the original Napster system, which was used by users to share their MP3 collections with everyone who ran a Napster client. Unlike Napster, however, gnutella allowed users to share any type of file, not just MP3s. It also did not have the single point of failure that Napster had: centralized servers that indexed where all the shared content was stored. Whereas Napster could be (and was) shut off just by turning off the centralized index servers owned by Napster, gnutella did not rely on any centralized servers to find out what users had what content, so once a gnutella network was created, it could not be shut off.