CHASE protocol

IMS sends CHASE requesting RQE1/CD to cause a synchronizing event after the receipt of an exception response when it is between pages (chains) of MFS-autopaged output and is not bound with Definite Response Chains Only.

IMS responds with DR1, as necessary, when receiving CHASE. IMS can receive CHASE between any two messages within a bracket. IMS can also receive CHASE as a synchronizing event after IMS has sent an exception response to MFS-autopaged input. (The sender of the MFS-autopaged input receives the exception response while between output pages or after a chain indicating RQE1.)

Only CHASE carrying EB is accepted while IMS is waiting for conversational input. EB causes the conversational output message to be dequeued, conversation mode to be terminated, and the Conversational Abnormal Termination exit routine to be invoked, just as if an /EXIT command had been received. The session is terminated if CHASE is received with any protocol other than EB.