Enterprise PL/I does not support the old preinitialization scheme and you may want to consider redesigning your applications. Language Environment preinitialization services should be used with Enterprise PL/I in the redesigned applications. However, if you want to run your preinitialized programs under Language Environment in the interim while waiting for them to be redesigned, this section describes the differences that you may want to consider prior to the migration.
The PL/I preinitialized program interface is supported with the following changes:
Language Environment preinitialization services support multiple preinitialization environments under the same TCB. Multiple preinitialization environments under the same TCB is not supported by OS PL/I. To understand how the service works, see "Using Preinitialization Services" in z/OS Language Environment Programming Guide.