Hum, we don’t set as replicated so that more than one person can use the same character, if that’s what you meant.
Replicated basically means that some properties from the character are “sent” from the server to clients, so that each client sees what the server sees. It also means that each client would have the same information from the server, the base of multiplayer.
I strongly suggest you to take a look at the Multiplayer Network Compendium by eXi, but feel free to ask more questions here 