Marks a method as being an RPC that when invoked will be called for all connected clients including the host. You can filter who receives the RPC by calling the RPC within the scope of <see cref="M:Sandbox.Rpc.FilterInclude(System.Collections.Generic.IEnumerable{Sandbox.Connection})" /> or <see cref="M:Sandbox.Rpc.FilterExclude(System.Collections.Generic.IEnumerable{Sandbox.Connection})" />.