constructed and sent via ``rte_mp_reply()`` function, along with ``peer``
pointer. The resulting response will then be delivered to the correct requestor.
+.. warning::
+ Simply returning a value when processing a request callback will not send a
+ response to the request - it must always be explicitly sent even in case
+ of errors. Implementation of error signalling rests with the application,
+ there is no built-in way to indicate success or error for a request. Failing
+ to do so will cause the requestor to time out while waiting on a response.
+
Misc considerations
~~~~~~~~~~~~~~~~~~~~~~~~