A bitfield of %NMSecretAgentCapabilities.
Identifies this agent; only one agent in each user session may use the same identifier. Identifier formatting follows the same rules as D-Bus bus names with the exception that the ':' character is not allowed. The valid set of characters is "[A-Z][a-z][0-9]_-." and the identifier is limited in length to 255 characters with a minimum of 3 characters. An example valid identifier is 'org.gnome.nm-applet' (without quotes).
If TRUE, the agent will attempt to automatically register itself after it is created (via an idle handler) and to re-register itself if NetworkManager restarts. If FALSE, the agent does not automatically register with NetworkManager, and nm_secret_agent_register() must be called. If 'auto-register' is TRUE, calling nm_secret_agent_unregister() will suppress auto-registration until nm_secret_agent_register() is called, which re-enables auto-registration.