Returns the locally known transaction identifier (up to 12 characters) for an APPC conversation.
&ZAPPCTRN provides the unique transaction identifier as defined in the local system's TCT (Transaction Control Table) and used during the allocation and attach process.
For local allocation requests, it corresponds to the value specified for the TRANSID operand in the &APPC ALLOCATE verb.
Example: &ZAPPCTRN
&WRITE DATA=CONVERSATION &ZAPPCID STARTED FOR TRANSACTION &ZAPPCTRN
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