The configuration information is stored in that location in the Windows Registry. Since the final key, MSConfig, is followed by a slash, it means that it's definitely a key (a container, not a value) that can hold registry values and/or keys (or be empty).
For the benefit of others who may be wondering what this is all about...
MSCONFIG (Microsoft's System Configuration Utility) is a tool that lets you make various changes to Windows, and it happens to be primarily concerned with how Windows starts up. Many of the settings are stored in the Windows Registry (see my next paragraph for more about this...).
REGEDIT (Registry Editor) is a tool that lets you view and edit the Windows Registry, which is a proprietary database that is used to store nearly all settings for the Operating System and most Windows applications.
Because you essentially have full access to every setting in the system, this tool can be particularly dangerous and its use could result in your computer not starting at all (or a wide range of other problems). It is considered to be a tool for users with an advanced level of expertise.
Note: I posted these screenshot images of these tools to satisfy the curiosity of those who also don't want to start these programs due to the risk of causing problems on their computers (hopefully this will help to prevent accidental problems by non-expert users).