System Exit Interface

The REXX System Exits let the programmer create a customized REXX operating environment. You can set up user-defined exit handlers to process specific REXX activities.

Applications can create exits for:

• The administration of resources at the beginning and end of interpretation
  
• Linkages to external functions and subcommand handlers
  
• Special language features; for example, input and output to standard resources
  
• Polling for halt and external trace events

Exit handlers are similar to subcommand handlers and external functions:

• Applications must register named exit handlers with the REXX interpreter. 
  Exit handlers can reside in dynamic link libraries or within an application EXE module.

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