The basic steps are:
To allow 3rd-party plugins to add support for WPf2b more easily, the API uses actions. This avoids the need to check if WPf2b is installed, then import a file, check for versions, and so on. Integration code can be written that will work if WPf2b is installed, and do nothing if not.
do_action has no return value WPf2b will throw an Exception if there is an error.