Windows Longhorn was Microsoft's codename for the operating system that eventually became Windows Vista, and its test builds included a distinct set of system sounds for hardware events. The USB-in chime was one of those sounds, designed to confirm a device connection without interrupting work. As Longhorn builds leaked and were shared by enthusiasts, its sounds were ripped and uploaded to soundboards, where retro computing fans kept them alive. Today it survives mainly as a nostalgia clip, instantly signalling an early-2000s Windows desktop to viewers who remember that era.