The NCDF_GROUPSINQ function returns an array of all the groups contained in the specified group.
            Examples
            See the example for NCDF_GROUPNAME.
            Syntax
            Result = NCDF_GROUPSINQ( Grpid )
            Return Value 
            Returns an array containing the IDs of all the groups contained in the specified group. If Grpid is invalid, an error message is displayed.
            Arguments
            Grpid
            The ID of the group to query, returned from a previous call to NCDF_OPEN, NCDF_CREATE, or NCDF_GROUPDEF.
            Keywords
            None
            Version History
            
            See Also
            NCDF_FULLGROUPNAME, NCDF_GROUPNAME, NCDF_GROUPPARENT