Interactive Debugging
You can enter the interactive debuging either by executing
a TRACE instruction with a prefix "?" or when calling RX
from dos command line issue as a first argument the trace
option: C:> rx ?r awari.r
In interactive debug, interpreter pauses before the execution
of the instructions that are to be traced and prompts for
input. You may do one of following things:
o Enter a null line to continue execution.
o Enter a list of REXX instructions, which are
interpreted immediately (DO-END instructions must be
complete, etc.).
During the execution of the string, no tracing takes
place, except that non-zero return codes from host
commands are displayed. Execution of a TRACE instruction
with the "?" prefix turns off interactive debug mode.
Other TRACE instructions affect the tracing that occurs
when normal execution continues.