In most cases, object modules and load modules created with OS PL/I Version 2 do not require relinking. Earlier sections of this migration guide discuss OS PL/I features in more detail. Some of these features do require relinking, however, and a few are no longer supported.
Language Environment supports OS PL/I applications that contain the PL/I assembler user exit, IBMxXITA. See Considerations for using assembler user exits for more information on this topic.