I'm familiar with VHF/UHF repeater-based nets and the general concept of how nets work (net controller that you check in with, net controller says who talks, people send it back to the controller after talking, and so on).
But how do HF nets work? Unlike VHF/UHF repeater-based nets where everyone can hear everyone, the nature of HF means it's pretty likely that not all people will be able to hear each other. Presumably you're required to be able to communicate with net control to be able to participate, but what happens beyond that? You hear who you hear and whoever happens to hear you hears you? Or do HF nets limit their membership to people who can hear everyone (or mostly everyone) in the regular crowd and keep out/refuse to acknowledge everyone else?