DFHISP
DFHISP is the CICS intersystem communication program that is invoked when a request to access resource has to be shipped to a remote system (through ISC or MRO). The requests passed to DFHISP are:
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File control
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Interval control
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Temporary storage
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Transient data
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DL/I
DFHISP controls the acquisition, use, and freeing of a session to the remote system, and invokes DFHXFP or DFHXFX to process requests and replies.
DFHISP is called by DFHDLI, DFHELR, DFHEIP, and DFHFCEI.
Reference Sources
CICS Transaction Server for z/OS Diagnosis Reference