1. They would also perceive the network! If the network is showing in any way through any kind of medium, it is always perceivable to all numbered who are physically close enough to perceive it.
This is, in fact, also true for private messages - imagine private messages as encoded phone calls. Nobody can tap into the phone call from somewhere else, but if you're physically standing next to Amanda who is having an encoded phone call, you will still be able to hear what Amanda says, and if she has Bob on speaker phone, you'll be able to hear his end to - and the other way around.
2. ...that is a good question. To keep it simple and to keep character sane, let's say that the network is formatted more akin to threads.
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This is, in fact, also true for private messages - imagine private messages as encoded phone calls. Nobody can tap into the phone call from somewhere else, but if you're physically standing next to Amanda who is having an encoded phone call, you will still be able to hear what Amanda says, and if she has Bob on speaker phone, you'll be able to hear his end to - and the other way around.
2. ...that is a good question. To keep it simple and to keep character sane, let's say that the network is formatted more akin to threads.