The document discusses a Supervisory Control and Data Acquisition (SCADA) system called the Tank Farm Subsystem (TFS) that controls the operation of oil and gas storage infrastructure. TFS uses a generic SCADA package called Real Time Application Platform (RTAP) along with customized software tools and a graphical user interface to monitor and control tank farms. It runs on HP workstations using a UNIX operating system and is configured with primary and backup computers connected over a local area network. The data structure of TFS is built around configurable point types that contain values, algorithms, and security features to model inputs, outputs, and calculations.