Atiyoga

  Atiyoga (Skt.; Tib. ཤིན་ཏུ་རྣལ་འབྱོར་, Wyl. shin tu rnal 'byor) — the highest yana within the classification of nine yanas of the Nyingma school. Atiyoga is synonymous with Dzogchen.

 Overview Given by Alak Zenkar Rinpoche[1]

The vehicle of Atiyoga, or ‘Utmost Yoga,’ is so-called because it is the highest of all vehicles. It involves the realization that all phenomena are nothing other than the appearances of the naturally arising primordial wisdom which has always been beyond arising and ceasing.
Entry Point

One’s mind is matured through the four ‘expressive power of awareness’ empowerments (Tib. རིག་པའི་རྩལ་དབང་, rigpé tsal wang), and one keeps the samayas as explained in the texts.
View
The Primordial Buddha Samantabhadra

The view is definitively established by looking directly into the naturally arising wisdom in which the three kayas are inseparable: the empty essence of naked awareness beyond the ordinary mind is the dharmakaya, its cognizant nature is the sambhogakaya, and its all-pervasive compassionate energy is the nirmanakaya.
Meditation

The meditation consists of the approach of cutting through resistance to primordial purity (Tib. kadak trekchö), through which the lazy can reach liberation without effort, and the approach of the direct realization of spontaneous presence (Tib. lhundrup tögal), through which the diligent can reach liberation with exertion.
Conduct

The conduct is free from hope and fear and adopting and abandoning, because all that appears manifests as the display of reality itself.
Results

Perfecting the four visions of the path, one gains the supreme kaya, the rainbow body of great transference (see rainbow body), and attains the level of glorious Samantabhadra, the thirteenth bhumi known as ‘Unexcelled Wisdom’ (yeshe lama).

Source

www.rigpawiki.org