For the Message Queue domogik is using the 0MQ (zero MQ) library. More info about this system can be found at http://www.zeromq.org/.
The details about all Domogik pub/sub are :doc: described here </technical/mq/pubsub_detailed>. The details about all Domogik req/rep are :doc: described here </technical/mq/reqrep_detailed>.