[V8i] Difference between MS_USERPREF (UPF file) & MS_USERINT_PREFS (UPF file)?

This may be a Power Inroads question, but I'll start here since it deals with configuration variables.

I've been having some issues with my User preferences "disappearing" lately, so I took a look in my preferences directory. I see two UPF files:

MS_USERINT_PREFS =  $(_USTN_PREFNAMEBASE)-$(_USTN_USERINTNAME).upf
mbloswick-PowerInRoads-mbloswick.upf

MS_USERPREF = $(_USTN_PREFNAMEBASE).upf
mbloswick-PowerInRoads.upf

According to Power Inroads -> Workspace -> Configuration, both of these UPFs are in use right now. Is that so? Is that possible?
From what I've been able to find online here, one of them is my actual preference file, and another one stores preference information about tools, etc?
How do both of these files respond if I save off a Preference seed (SPF)?

Thank you.
Mary Bloswick
Power Inroads 08.11.07.615

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