cfgfile (string, may be null) specifies the filename (AMOS or native) of a configuration file containing additional parameters of the type that are thought likely to vary by installation but otherwise remain fixed for that installation. See the subsequent section describing the configuration file in more detail. Note that all of the parameters after status are optional on the XCALL, but only to the extent that the corresponding parameter is defined in the configuration file. Alternatively, you can omit the configuration file entirely, in which case you must specify all of the parameters on the XCALL line.