The communications work entry identifies to the subsystem the sources for the communications job it will process. The job processing begins when the subsystem receives a communications program start request from a remote system and an appropriate routing entry is found for the request.
For performance reasons, instead of starting a communications job each time a program start request is received, you can configure a prestart job to handle a program start request from a remote system. For a communications batch job to run on an iSeries™ system, a subsystem description containing a work entry for communications work must exist on the system.