TSSPro3 software for the GCmate II, LCmate, and JMS-600 mass spectrometer systems is designed to offer a more intuitive user interface, more powerful instrument and inlet control functions, and tools to assist with regulatory compliance. TSSPro3 operates on Microsoft Windows 2000 or Windows XP platforms. The TSSPro3 Instrument Control program combines Tune and Calibrate, Inlet Control, and Data Acquisition functions into a single integrated package. The instrument logbook keeps a day-by-day history of all operations performed by each operator. New inlet control functions support an extended variety of GC and autosampler functions. All GCmate and LCmate instrument control functions are fully supported under data system control.