Restrictions

The following mainframe REXX facilities are not supported by MSS:

• Sequence numbers in the last eight bytes of fixed-length source records are recognized but no checking is done on the order of these numbers. Sequence numbers in variable-length records are not recognized.
• The TRACE S instruction is syntactically allowed but does not trace the remaining clauses in the exec. The exec is fully syntax checked when it is first loaded.
• Numeric options entered during interactive debugging are not supported.
• CICS REXX is not supported.
• Compiled REXX execs are not supported.
• APPCMVS, ATTACH, ATTACHMVS, ATTACHPGM, CONSOLE, CPICOMM, ISPEXEC, ISREDIT, LINK, LINKMVS, LINKPGM, and LU62 host command environments are not supported:
• User-defined host command environments are not supported.
• The following REXX programming services are not supported:
  • IRXEXCOM - variable access routine
  • IRXEXEC - exec processing routine
  • IRXHLT - halt condition routine
  • IRXIC - trace and execution control routine
  • IRXINIT - initialization routine
  • IRXLIN - LINESIZE function routine
  • IRXRLT - get result routine
  • IRXSAY - SAY instruction routine
  • IRXSUBCM - maintain entries in the host command environment table
  • IRXTERM - termination routine
  • IRXTXT - text retrieval routine
• Replaceable routines and exits are not supported.
• DBCS is not supported.