Host offers?

can anyone tell me how do host offers work?

I have a general idea of what it is and how it works; what I want to know is more of the technical side.

Say, if someone asks you for a host offer, what’s next? do they just go ahead to generate leads then send them all to you at an agreed time?

I read some posting instructions, they always give you an adress to post the leads to. I work for a network, if all the leads are posted to the designated address (usually the advertiser’s), what’s the role the network playing then? does this mean the network doesn’t have access to the leads anyways?