Not quite. Your process does not become a Runtime Resource (RR) when it runs; rather, the RR is the machine that you are running your process on. The term "Resource PC" (RPC) is a Control Room term, since the list of RR's shown on the Control Room screen is comprised of all the RR's available to you. So, you drag your process over to the desired machine in the RPC's list, and it runs on the RR associated with the selected machine. So, as you can hopefully see, RR and RPC mean the same thing, and RPC is a list of RR's.
I don't mean to make this so complicated. Don't focus so much on RPC's but instead know the difference between RR and Interactive Client (IC).
I'm afraid I am not able to give you a link on the Portal. You will need to search for it yourself.