Well, just to guide Banshee on writing that FAQ, I'll post some things that I am not 100% clear on here anyway.
Let's take the following scenario: We have a building, with a small security network (one single host) that controls the building's cameras, locks, etc. So, all these devices are part of the host's private space.
1) What do I see, if I just look into the Matrix, without Matrix Perception? Nothing (Can hosts run silent?)? Just the host?
2) If I roll Matrix Perception to find the Hidden Network, I would roll Electronics + Intuition vs. Hosts Willpower + Sleaze... if I succeed, do I now also see all the devices managed by the host, or just the host?
3) If I can see the icons that are part of the host, without being in the host, can I hack them while ignoring the host? And, if I can do so, do they defend with the hosts attributes or with their own?
4) If I can hack icons without entering the host, I guess the big advantage of hacking a host is to gain access to the whole network at once... instead of hacking device by device... correct?
Edit: I have to add that in my campaigns Decking comes up way more often as a means of messing with security than for actual Data Steals. That's why I want to really understand the relationship of Hosts and their Devices correctly.