Targeting COBOL programs for certain environments

Developing COBOL programs for CICS
Programming for a Db2 environment
In general, the coding for a COBOL program will be the same if you want the program to access a Db2® database. However, to retrieve, update, insert, and delete Db2 data and use other Db2 services, you must use SQL statements.
Developing COBOL programs for IMS
Although much of the coding of a COBOL program will be the same when running under IMS, be aware of the following recommendations and restrictions.
Running COBOL programs under z/OS UNIX
To run COBOL programs in the z/OS® UNIX environment, compile them using Enterprise COBOL or COBOL for OS/390® & VM. The programs must be reentrant, so use the compiler and linker option RENT.
Developing AMODE 64 programs
In general, the design considerations for AMODE 64 applications are the same as AMODE 31. With a few exceptions, the syntax and semantics of COBOL language features are the same between LP(64) and LP(32). See related tasks for the key differences and considerations.
Developing COBOL programs in the mixed AMODE Language Environment

Parent topic: Programming guide