I'm not particularly current in the OOREXX implementation, but I spent a lot of years doing Rexx in VM/CMS.

TRACE I         -- 'I' for 'Interactive'.  Pauses after each instruction.

On some other platforms (most DOS/Windows implementations I've seen) there's also the '?' prefix, but I don't recall having it, let alone needing it in VM/CMS.  On the other hand, the last time I worked in that environment was 1996....

Does this help?

William Lightner