Each extension within the supplied NDF is searched to see if it contains any NDFs. The paths to any such NDFs are appended to the end of the supplied group (a new group is created if none is supplied). NDF identifiers for particular members of the group can be obtained using NDG_NDFAS.

CALL NDF_MOREG( INDF, IGRP, SIZE, STATUS )

INDF = INTEGER (Given)

IGRP = INTEGER (Given and Returned)

SIZE = INTEGER (Returned)

STATUS = INTEGER (Given and Returned)

• Each element in the returned group contains a full specification for an NDF. Several other groups are created by this routine, and are associated with the returned group by means of a GRP "owner-slave" relationship. These supplemental groups are automatically deleted when the returned group is deleted using GRP_DELET. The returned group should not be altered using GRP directly because corresponding changes may need to be made to the supplemental groups. Routines NDG_SETSZ, NDG_GTSUP and NDG_PTSUP are provided to manipulate the entire chain of groups. The full chain (starting from the head) is as follows:

• NDF slice specifications

• HDS paths

• File types

• Base file names

• Directory paths

• Full NDF specification (this is the returned group IGRP)