The W.M. Keck Observatory operates a laser guide star (LGS) system in conjunction with the adaptive optics system on the Keck II telescope. Because several other observatories are also in operation at the summit of Mauna Kea, the W.M. Keck Observatory, in collaboration with the Gemini Observatory and the Mauna Kea Laser Guide Star Technical Working Group, has developed a laser traffic control system (LTCS) software package for ground-based astronomy. It is composed of a software program that calculates beam "crossing" geometries between a telescope with a laser and other telescopes in close proximity. Its main function is to calculate potential beam crossing events and to issue laser shutter commands as needed to prevent the laser from interfering with observations at other observatories. This software is only useful to observatories that operate LGS systems. The software is available for a small administrative fee. Support for installation and application of the software is not generally available from the W.M. Keck Observatory staff, and prospective users will be required to sign a license agreement for the software. For further information contact Douglas Summers, CARA, W. M. Keck Observatory, 65-1120 Mamalahoa Hwy, Kamuela, HI, 96743 (808) 885-7887.