It would be good to clarify in the user manual here that it's possible to send project resources any which way: from Controller -> Agent(s) as well as Agent -> Agent(s).
It would be nice to also clarify that while "Send Tags" can only send tags from the Controller -> Agent(s) and cannot directly send tags from Agent -> Agent(s), you can configure remote tag providers on the Controller which connect to the source Agent(s) and then send these on to other destination Agent(s) via the Controller's remote tag provider.