Additional DDM concepts

Most users of DDM will not need the information in the remainder of these topics; it is intended primarily for experienced programmers who need to know more about DDM.

Described are conceptual details and examples about:

• Program start requests, which start the TDDMs (target jobs)
• Open data paths (ODPs), used to access the files
• Remote location information
• DDM conversations, established for source and target communications
• Source and target jobs
• I/O operations within a job