The initial NBP is a Boot Manager able to retrieve its own configuration and deploy a menu of booting options after the user selects a booting option an OS dependent Boot Loader is downloaded and run in order to continue with an specific booting procedure.
The initial NBP is a Boot Manager able to retrieve its own configuration and deploy a menu of booting options after the user selects a booting option. An OS dependent Boot Loader is downloaded a booting option. An OS dependent Boot Loader is run in order. This was to continue with an specific booting procedure a booting option.