Windows NT 4.0, released by Microsoft in 1996, was a business-focused version of Windows used widely on office workstations during the late 1990s. Its shutdown sound accompanied the closing of the system, becoming familiar to people who used those machines daily. As those computers disappeared, the chime survived through retro computing videos, nostalgia compilations and online sound libraries, where it now serves as an audio shorthand for the era. It remains popular because it is instantly recognisable to older users while sounding quaint to younger viewers discovering vintage technology.