Where is the DFU firmware version stored in controller?

[JChan.0]

I'm just starting with DFU, so apologies if this isn't the right sort of question. The documentation shows that the firmware version (in the DFU file) is stored in the DFUSUFFIX in the bcdDevice field along with Product id and Vendor id. I'm wondering if this is stored on the controller in a particular register, variable, or place in the memory and can be accessed by code? If so, how would I access it? Basically wondering how to check the current application firmware version from code, if it is managed through DFU.