NDF_BOUND( INDF, NDIMX, LBND, UBND, NDIM, STATUS )
-- Enquire the pixel-index bounds of an NDF
NDF_DIM( INDF, NDIMX, DIM, NDIM, STATUS )
-- Enquire the dimension sizes of an NDF
NDF_ISACC( INDF, ACCESS, ISACC, STATUS )
-- Determine whether a specified type of NDF access is available
NDF_ISBAS( INDF, ISBAS, STATUS )
-- Enquire if an NDF is a base NDF
NDF_ISTMP( INDF, ISTMP, STATUS )
-- Determine if an NDF is temporary
NDF_NBLOC( INDF, NDIM, MXDIM, NBLOCK, STATUS )
-- Determine the number of blocks of adjacent pixels in an NDF
NDF_NCHNK( INDF, MXPIX, NCHUNK, STATUS )
-- Determine the number of chunks of contiguous pixels in an NDF
NDF_SAME( INDF1, INDF2, SAME, ISECT, STATUS )
-- Enquire if two NDFs are part of the same base NDF
NDF_SIZE( INDF, NPIX, STATUS )
-- Determine the size of an NDF
NDF_VALID( INDF, VALID, STATUS )
-- Determine whether an NDF identifier is valid