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Watcher:. Monitors inputs for suspicious activity. Existing IDS may be implemented as pluggable watcher. Listener:. Gathers warnings from watchers and informs Access Controller. Central point of information gathering. Access Controller:. Controls access to resources based on advice from listener. Reporter:. Reports intrusion attempts to Indra peers. Gives Indra distributed functionality. Plugin Loader:. Loads pluggable Watchers, Access Controllers, . . ..