.-SVC97---.   
>>-+---------+-------------------------------------------------><
   '-NOSVC97-'   

When the SVC97 option is set, IDF uses SVC 97 for breakpoints.

When the NOSVC97 option is set, IDF does not use SVC 97 for breakpoints. Instead, it uses invalid opcodes. NOSVC97 must be specified if running IDF in a z/OS (non-TSO) batch environment.

The SVC97 and NOSVC97 options can be set only at invocation, or within the profile macro prior to the load of the user application.

For more details see section Breakpoint method selection (TSO).