In shooter game ServerFireProjectile in ShooterWeapon_Projectile is a server only RPC function used to spawn projectiles on the server that get replicated to the client.
ShooterWeapon_Instant has code for doing client side effects of an instant hit ray trace that is verified on the server using the ServerNotifyHit related functions. It also replicates the FInstantHitInfo struct to other clients. Those two classes are pretty much the core behavior for server authoritative gameplay. The project also has code for multipler maps/loading/etc as does the Unreal Tournament code.