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Specifies the name of the library from which Z Data Tools is to load the Z Data Tools options module - usually HFM0POPT. Note that the member keyword can be used to specify an alternative name to HFM0POPT, if required.

If the DSNAME keyword is specified, Z Data Tools bypasses the usual library search when loading the Z Data Tools options module and only searches the specified library for the module.

When the DSNAME keyword is omitted, Z Data Tools searches load libraries allocated to the user's session in the normal order, for example, LIBDEF, ISPLLIB, STEPLIB, JOBLIB, link list.

One use of this option is in an environment with stringent security requirements, where it is necessary to ensure that all Z Data Tools users access a particular Z Data Tools options module, and that the use of this option module cannot be avoided.

The DSNAME keyword is optional.