Actually, mixing calls between OPM and ILE COBOL programs can be fairly easy. 
If you expect to call an ILE program, use 'EXIT PROGRAM AND CONTINUE RUN 
UNIT.' This allows the called ILE program to be used by either an OPM or ILE 
program. Parameters in the linkage area are passed back and forth. Since the 
ILE program is still running, the next time it is entered the WORKING-STORAGE 
DIVISION contains the last settings. All files are still opened. There are 
other options that provide additional object control and you can find them 
described in the ILE CONCEPTS and COBOL manuals.

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