This section describes accessing data using the DataAgent parameters. A DataAgent can only be started from a DDM application from a client workstation. You can use the DDMOpen function to get a filename suffix that can be used to start DFM DataAgent processing on z/OS®. The DDMClose function terminates DataAgent processing. It issues the DDM commands CLOSE and DELDCL, which actually terminates agent processing by invoking the exit with the DELDCL code point in the parameter list, if requested.