• Pre-environment initialization: IRXINITX

  Perform processing before a new language processor environment is initialized.

• Post-environment initialization: IRXITTS or IRXITMV

  Perform processing after a language processor environment is initialized.

• Environment termination: IRXTERMX

  Perform processing before a language processor environment is terminated.

• Exec processing:

  Perform special processing before a REXX exec is executed.

• Attention handling:

  Perform special attention processing in an environment integrated with TSO/E.

• Exec initialization:

  Access or update REXX variables.

• Exec termination:

  Access or update REXX variables.

Refer to Customizing REXX processing.