This image shows an example of the logical sequence of events when a subsystem is used.

A system administrator on a workstation starts a batch process on the enterprise server to launch pick slip in subsystem mode R42520.

The pick slip subsystem R42520, version ZJDE0007 looks for records in the subsystem table with status R42520, fetches and processes the records, and returns the status.

A sales order clerk on a workstation issues a pick slip request using a version of P42520 defined to use a subsystem on the server.

P42520 writes a W record to the subsystem table to process the request on the subsytem.