This text by the great Nyingma master Mipham Rinpoche (1846 - 1912) comprehensively covers Buddha Shakyamuni’s teachings, exploring the different tenet systems in Tibetan Buddhism.  Lama Jampa has described it as an essential component of a dharma curriculum. 

On the last day of the teaching, Lama Jampa will give the initiation of Namgyalma - one of the key longevity deities of Vajrayana Buddhism. Namgyalma is also a powerful source of transcendental wisdom.  As usual, refuge will be granted during the early part of the initiation to anyone who wishes to take it.