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Historically, Human Machine Interface (HMI) and Supervisory Control and Data Acquisition (SCADA) systems were not included in the scope of the charter for Information Technology (IT). Process engineering or the plant maintenance organization were normally tasked with the responsibility for the SCADA/HMI systems. In the many cases, a lone electrician was responsible for the entire system, including the workstation, the ICN and the Programmable Logic Controller (PLC). In this era of SCADA/HMI the ICN was rarely interconnected with the IT enterprise network or the Internet. Remote access was typically done using phone modems connected directly to the SCADA host workstation.