Some SR5 questions, Uh, what now? Options

[Maelwys]

Alright, so some observations...

The RCC itself doesn't have a sim module (which is sort of strange), but presumably I'm supposed to be using the sim module from my VCR. Is that sim module hot or cold?

If I decide to use the VCR's sim module to access AR and VR (not necessarily for rigging, but for the DNI effects), is it obvious that I'm using it? If I decide to go down to the corner shop, using a trusty decoy commlink, would it be obvious that I'm using a restricted VCR to provide the DNI?

One of the stories talks about a guy browsing the music on a girl's commlink because she had it in a public folder. The hacker still had to hack it to download it but was able to see the software, IIRC.

Are there any rules for private folders? Or is it just one of those handwavium things where you tell the GM that files on the commlink aren't publicly viewable? I can sort of understand some things being open to the public "I got an advanced copy of the new Darwin's Bastards album, everyone that looks at me can see it!" but everything public seems beyond silly, but I don't recall seeing anything like that.