>> You will see in Chapter 5, "Controlling the Execution of Transaction 
Programs", 
>> section "Specific Scheduler JCL Information for TP Profiles", that the 
JOB 
>> statement is required and that there is a specific section all about 
the 
>> &SYSUID variable.

>I think the question here is how much of the JCL conversion and 
>interpretation process happens as a result of running the ATBSDFMU 
>utility? Specifically, for an APPC/MVS transaction, when does MVS JCL 
>conversion take place? When does MVS JCL interpretation take place?

  I used to know a fair amount about this 20 years ago when MVS/APPC was 
in development, but
seem to have forgotten a lot.  Some code scanning suggests that JCL 
Conversion is done
when a TP Profile is Added via ATBSDFMU for purposes of syntax checking 
only. 
Conversion is done again under FMH5 processing in the APPC address space 
when a transaction
for  that profile comes into the system.  It looks like like the results 
of the conversion may be cached
under some circumstances so that it does not need to be converted again 
for the next request.
Maybe that has something to do with the presence of symbols.


Jim Mulder   z/OS System Test   IBM Corp.  Poughkeepsie,  NY

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