System high mode, or simply system high, is a security mode of using an automated information system (AIS) that pertains to an environment that contains restricted data that is classified in a hierarchical scheme, such as Top Secret, Secret and Unclassified.
System High Mode, or System High, is a security setting for automated information systems (AIS) used in environments with sensitive data categorized by a hierarchical classification system like Top Secret, Secret, and Unclassified.