Activation Group - Mix - Please check

This has been covered many times and I've researched the archives often - and 
taken notes. About ready to go live with a new system and am getting cold feet. 
Could someone please review  this?

All applications here are using the default activation group. All data base 
files are SHARE *NO. Seldom OVRDBF.  Many overrides to printer files in the CLs.

I'm introducing service programs in an application that is all new development. 
All CLs are *NEW and their called programs are *Caller.  All files are accessed 
via I/O modules (service programs). Date, messaging, check obj,  and display 
file info service programs are included.

However, this application will submit jobs that call existing programs.

We also have dozens of programs that if they were written today, would be 
service programs (calculate special assessments, calculate delinquent taxes, 
etc). Many are OPM; all run in the default activation group. All of the 
programs that the new system will submit call one or more of these programs. 
Most of these programs return data to the calling program via work files in 
QTEMP. 

Some of the programs that are submitted from the new system access the same 
files as one or more of the called programs noted above - in addition to the 
work files in QTEMP. For examle, one program accesses the certificate logical 
#1 and the called program that calculates the certificate interest also 
accesses the same logical. Both are input only. Other instances can exist where 
either one or the other might update the common file.

I have not introduced the file  I/O modules into existing programs.

I have modifed the particular programs that get submitted from the new system 
(the system schedules specific periodic jobs). Again, each CL is *New; each RPG 
pgm is *Caller.

My questions are: 
How does being in different activation groups affect accessing the same file in 
the same submitted job?


In the future: If these were interactive jobs and we bounced around through the 
OPM programs in the menu system and occasionally got to ILE programs that were 
in their own activation group and accessed the same files (same logicals), 
would I be creating a mess?

My boss asks if I am sure that I won't be creating problems with file updates.

I'm thinking we're OK because no files are SHARE *YES and we seldom override 
data base files. 

TIA

Fran Denoncourt
Sr. Programmer/Analyst
Pinal County Treasurer's Office
Florence, AZ 85232
(520) 866-6404