Many little questions.

• What does "UNP" stand for? The UNP page at Nexus doesn't say. I know the "B" in "UNPB" stands for "Blessed", because, well, the person with that body has been blessed with generous proportions.
  
• Can you only usually use one of them at a time? Does this mean that everybody will have the same body - or are their original slider settings preserved, and so they still have differing body shapes?
  
• As for texture replacers, are facial texture replacers separate from ones that alter body textures?
  
• And with Coverwomen - there are basically four "looks". Does anybody know if only one can be used at a time?

Thanks. Just poking around the Nexus and trying to figure some of these questions out, and it's a bit tough since obviously there's a lot more traffic here than in the comments sections for each mod. If anybody can help out, thanks. I post questions to the mod pages in the comments sections, but they aren't always very heavily trafficked, it seems.

1. Not sure what UNP stands for, good question... I do too wonder.
2. You can only use one body mod at a time, UNLESS you set up a custom race that specifically uses the mesh/textures of them (you would have to rename the files so that they don't replace vanilla).
3. Head textures are different from body textures, yes.
4. I would guess you could only use one of the "looks" at a time, although I don't suggest using Coverwoman - I prefer http://skyrim.nexusmods.com/mods/2812.

The Nexus page seems to suggest it stands for UNPretended.

Yes, you can only use one of them at a time, but I quote from the description (which you should read by the way, it answers all your questions )