Here are the data structures with brief descriptions:

CDeviceNameHelper	Generic base class used by all storage methods
CDeviceNameHelperData	Data typically stored in retained memory or EEPROM to avoid having to fetch the name so often
CDeviceNameHelperEEPROM	Version of DeviceNameHelper that stores the name in EEPROM emulation
CDeviceNameHelperFile	Store the device name in a file on the flash file system
CDeviceNameHelperNoStorage	Version of DeviceNameHelper that stores the name in volatile RAM
CDeviceNameHelperRetained	Version of DeviceNameHelper that stores the name in retained RAM