(1) In Internet communications, a message that governs the aspects of a tunnel and sessions within a tunnel.
(2) An incoming message received from a clearing channel or the S.W.I.F.T. network that indicates the status of the payment.
(3) In Q replication, a message from a Q Apply programme or a user application that asks a Q Capture programme to activate or deactivate a Q subscription or an XML publication, invalidate a send queue, or confirm that a target table is loaded.