System properties are settings that are set in the Java Runtime Environment for the Integration Server. These settings are either predefined by the Java system (e.g. java.version or file.separator), passed as parameters to the Integration Server in the start script (e.g. LOG_FILE) or set by the Integration Server itself (e.g. HUB_SYSTEM_ID).

Environment variables are settings that are set in the operating system environment. These settings are either specified by the operating system (e.g. COMPUTERNAME) or are set by the start script of the Integration Server (e.g. ARGS).

To determine from which files certain Java classes are loaded into the Java runtime environment, one can use the localisation of classes in the system.