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   You might try using a data area that indicates if a process is active or not 
and have each program look at this data area prior to doing any 'real' 
processing.  If it finds that the data area indicates that a job is currently 
active, you could put it in a wait state for a period of time, say 5 minutes 
then check the data area again.  Obviously, each program would set the data 
area to a value (indicating activity) when it is initiated (after it checks to 
see if is safe to run) and reset the data area at completion.  I have used this 
method very successfully in the past.  The only rub comes in at an abend.  You 
then either need some recovery/reset logic built in, or you have to manually 
reset the data area.
Thats my 2 cents.





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