a user secret agent is responsible for providing and storing this secret; when it is required agents will be asked to retrieve it
the system is responsible for providing and storing this secret (default)
in situations where it cannot be automatically determined that the secret is required (some VPNs and PPP providers don't require all secrets) this flag indicates that the specific secret is not required
this secret should not be saved, but should be requested from the user each time it is needed
These flags indicate specific behavior related to handling of a secret. Each secret has a corresponding set of these flags which indicate how the secret is to be stored and/or requested when it is needed.