A text elucidating the meaning of a tantra [LLB 2002]

Esoteric teachings that elucidate the tantras. In the tantra classification of the Nyingma school, the inner tantras are divided into three groups: mahayoga, anuyoga, and atiyoga. In this same system, these three groups are also referred to as rgyud, lung, and man ngag (Skt. tantra, agama, and upadesha, respectively), where mahayoga is regarded as tantra (rgyud), anuyoga is regarded as elucidation (agama, or lung), and atiyoga is regarded as pith instruction (upadesha, or man ngag). [WL 2012]

are not the Dharma of realization (Tib. rtogs). [ZT, 2006, translator's notes]