ooRexx v4.0.0, Fedora 9.
Trace ?R seems to ignore the "interactive on" (?) switch in the presence of STDIN data waiting.
Trace Off doesn't work no matter whether I/O is piped in via STDIN or I use a normal persistent file.
(Note: I'm an old Classic REXX programmer from the early 80s. Read the documentation, did what seemed plausible. Let me know if I'm out in outer space)