   end
 
   @doc """
-  Receive an UNREGISTERED message from `peer` with `unregister_id`.
+  Receive an `UNREGISTERED` message from `peer` with `unregister_id`.
   """
   def receive_unregistered(peer, unregister_id) do
     receive do

  end

  @doc """
  Receive a REGISTERED message from `peer` with `register_id`.
  """
  def receive_registered(peer, register_id) do
    receive do

  end

  @doc """
  Send a `YIELD` message from `peer` for `invocation`.
  """
  def cast_yield(peer, invocation, options \\ []) do
    {:ok, yield} = new_yield_message(invocation, options)
