Posting multiple times in multiple places does not get you more or better responses. In fact, it tends to lower the possibility of ANY responses. Especially since you posted a REXX question in the COBOL and JCL forums before posting in the CLIST & REXX forum.
I've locked the other two posts so any responses you get will be in the right place.
It also took 3 seconds with Google to find a web site that states you are not even looking at the right REXX code:
A REXX exec used in conjunction with ISRTCB exec. It takes the entry point of a load module and begins searching for a specific CSECT. If it finds one, the exec displays the CSECT's eye-catcher.
Where is your ISRTCB code?