To run COBOL programs in more than one task with Language Environment, the COBOL programs must be Enterprise COBOL for z/OS, COBOL for OS/390 & VM, COBOL for MVS & VM, or COBOL/370. Running VS COBOL II programs in more than one task is not supported. When you use COBOL programs in more than one task, it is recommended that the COBOL programs be compiled with the RENT compiler option, and that the load modules be linked as REUS and RENT.
MAIN .
task . Subtask B
.
CBL1 .
| .
V .
CBL2 <---.------------
| . |
V . |
ASMA----(attach)---->CBL3