If an application prompts the user for an NDF using the facilities of the NDF_ system (see SUN/33), the user may only reply with the name of a single NDF. Some applications allow many input NDFs to be specified and the need to type in every NDF name explicitly each time the program is run can become time consuming. The NDG package provides a means of giving the user the ability to specify a list (or ``Group'') of NDFs as a reply to a single prompt for an parameter.
The current version of NDG can process NDFs which are stored as components within an HDS container file, and can also process foreign data formats using the system described in SSN/20.
NDG [1ex