For history imports, it contains an “On Demand Poll Scheduler”, which has configurable poll rates used in “on demand polling” of imported histories, if so configured.

For history exports, it acts a container for one or more “config rules”, which specify how the configuration of the local history (archive) is set when the history is “pushed” (exported) into the station. Configuration rules are applied only when the history is created, that is, when first archived to the station. Changing a rule has no effect on existing histories.