Abstract: In an IMS/ESA environment, an ITASK is provided so as periodically to check IMS application programs to determine whether any is hung, thus providing notification for hung transactions that sometimes occur after an asynchronous APPC call issued by IMS from the IMS dependent region during syncpoint processing. APPC calls cause a time stamp to be written, which is used by the ITASK to determine how long the transaction is in a response wait state. The ITASK is reactivated after a waiting period dynamically determined on the basis of the processes active and a minimum interval. Detection of hung transactions results in a remedial action being taken.

Abstract: A communication system includes a network of transaction management systems having the same or different operating system software versions. Each transaction management system includes an associated input device for generating a transaction request or message switch. The transaction requests and message switches generated by a particular input device can be executed by the transaction management system associated with the device, and alternatively by remote transaction management systems in the network. To provide for remote execution of transaction requests and message switches, the system includes means for generating transaction request messages and message switch messages that have prefixes which can be dynamically extended as required for use by the appropriate remote transaction management system, without requiring upgrading the software of the remote system.