You: "Oh hey, can I get <thing> done, please, client?"
Client: "Hang on, lemme check the server for permission." *sends messenger with packet*
WITHOUT RR:
Server: *reads packet* "FUCK no." *sends packet back with same messenger saying No.*
Client: "Sorry, that's a no-go, User."
You:
WITH RR:
Realm Relay: *punches out the messenger and reads the request* "Yeah, I'mma just do <thing> for you User." *sneaks into Server's house in the middle of the night, steals some shit, eats a steak from the fridge, and comes back to you with the thing* "Here's your <thing>, all done."
You: "Thanks Realm Relay!"
If you want anything more intensive than a skit like that, use the damn Search Bar. Designers put them in forums like these for a reason.