DFHMAC-PASSTHRU is used by the service requester to
access the passthrough processing in the runtime environment.
This container holds the DFHMAH and DFHMAH2 headers that provide
the passthrough processing with the information necessary to carry out the
request. It also contains any application data that is required. The maximum
length of the container, including the headers, is 32,500 bytes.
The container
is mapped by copybooks DFHMAHV and DFHMAH2V, which are located in the SCIZMAC
library.