High Quality Content by WIKIPEDIA articles! NLTSS, the Network Livermore Timesharing System, also sometimes known as the New Livermore Time Sharing System was an operating system that was actively developed at Lawrence Livermore Laboratory (now Lawrence Livermore National Laboratory) from 1979 until about 1988, though it continued to run production applications until 1995. An earlier system, the Livermore Time Sharing System had been developed over a decade earlier.