As a means of identifying the request and any data associated with it, a unique request identifier is assigned by CICS® to each DELAY, POST, and START command. You can specify your own request identifier by means of the REQID option. If you do not, CICS assigns (for POST and START commands only) a unique request identifier and places it in field EIBREQID in the EXEC interface block (EIB). You should specify a request identifier if you want the request to be canceled at some later time by a CANCEL command.
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