This topic discusses considerations for MVS/ESA SP that you should be aware of when writing a Command Processor or using the services documented in this information. You should be familiar with the publications that describe comprehensive programming considerations for MVS/ESA SP as well as with those that describe the routines and macros discussed in this manual. Interfaces for service routines and macro instructions mentioned in this topic are covered in more detail in the chapters of this manual describing the individual service routines and macro instructions.