Some programs, particularly REXX function packages, need environmental setup for debugging because they are invoked by the REXX interpreter. There are other special considerations that apply to any program that is invoked by REXX.

REXX functions must return an EVALBLOK. If you quit from IDF while in the middle of a REXX function, an error message is issued by the REXX interpreter, and you may have to re-IPL CMS.

There is no practical way for IDF to prevent this from happening.