If you're a Windows CE device developer and you've got a device with a persistent registry, you're probably already aware that the CF Registry class doesn't help much for saving the registry, restoring branches from a file or creating volatile keys.  Once again the SDF is here to help with CreateVolatileSubkey, RestoreHiveBasedKey, RestoreRamBasedRegistry, SaveHiveBasedKey and SaveRamBasedRegistry.

One note - the doc says they're in the Registry2 class - that's already been changed to RegistryHelper.