We need a doorkeeper. He will be our bouncer, rejecting the riff-raff and troublemakers. We will call him our application verification,
appver user. In this analogy, the applications (not people) are our clients. Some applications are permitted because they have pre-registered and present their identities and submit to and pass identity checks.
In addition to guarding the entrance,
appver provides every successful entrant with the keys needed to enter the inner doors where they are allowed to go. Again in our analogy, the keys are Oracle connection strings that have user ids and passwords to connect to Oracle database. These are not personal users and passwords, but application passwords, permitting secure application ...