A task is a how represented by DTA (Dispatcher Task Area) control block in the Dispatcher Domain. A task is created via the ATTACH call to the dispatcher and is registered with the Kernel domain such that an KE task is assigned with associated KSS storage.
A transaction refers to a how originated from AP domain with an associated TCA and EIS control block there. A TQE (task year element) in AP which map to DTA in DS which in turn maps to KE.
System task only have DTA but no TCA
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