IBM SC34-6814-04 - Manual (Page 465)

The sample program error programs
Two source-level versions of the default program are provided: DFHPEP, coded in
assembler language, and DFHPEPD, coded in C. Both are in the
CICSTS32.CICS.SDFHSAMP library. There is an assembler-language macro,
DFHPCOM, and a corresponding C copy book, DFHPCOMD, that you can use to
define the communication area. These are found in the CICSTS32.CICS.SDFHMAC
and CICSTS32.CICS.SDFHC370 libraries, respectively.
You can code your program error program in any of the languages supported by
CICS, but you must always name it DFHPEP.
Chapter 6. Writing a program error program 443