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FAN is mostly used in conjunction with the Oracle connections pools (like UCP), where it is already integrated and implicitly used. I know very few people using FAN events directly.
However FAN over OCI is very useful for OCI clients (like sqlplus) as well.
check following whitepapers on client connectivity:
This should give you examples where FAN is used.
Furthermore there is a mechnaism on the server itself to react to FAN events (called FAN Callout). This could e.g. be used to restart the app server on database down/instance down, if the app server does not deal with connection pools etc.