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Microsoft Windows NT 4.0 (codenamed Cairo/SUR) is an operating system released in 1996-2001 and as a beta 1 version in 1995 and 1997 as a server edition terminal edition service pack 3 edition (codenamed Hydra) and 2 version in 1996 and 1998 as a terminal server edition service pack 3 edition. This includes robotz, musica, jungle, and utopia sound schemes.