Terms you need to know

This topic describes some terms you may need to know as you use this section.

Migration: Activities that relate to the installation of a new version or release of a program to replace an earlier level. Completion of these activities ensures that the applications and resources on your system will function correctly at the new level.
Coexistence: Two or more systems at different levels (for example, software, service, or operational levels) that share resources. Coexistence includes the ability of a system to respond in the following ways to a new function that was introduced on another system with which it shares resources: ignore a new function, terminate gracefully, support a new function.
New releases of SMP/E generally add to or enhance the information stored in SMP/E data sets. This new or enhanced data is not always compatible with previous releases of SMP/E. Results are unpredictable when a prior release of SMP/E encounters data introduced by a later release. Therefore, IBM® provides toleration PTFs that allow selected prior releases to ignore changes introduced by a later release. In some cases, a compatibility PTF or small programming enhancement (SPE) is available to add a new function to selected prior releases. z/OS Planning for Installation. provides a list of the required toleration and compatibility PTFs for each prior release of SMP/E.