DFHKCD
DFHKCD is the dispatcher part of task control module DFHKCP for CICS version 2.1. It performs the following functions:
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checks for the expiration of any time-ordered event and calls internal control to initiate the event.
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frees some storage areas if CICS is short on storage.
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scans the chain of active tasks to locate and dispatch an eligible task.
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interfaces with operating system timer facilities.