The Four-Session Guru Yoga that we practice, composed by the Eighth Karmapa Mikyo Dorje, was based on an earlier guru yoga found in the writings of Lama Shangtsalpa's (Lord Gampopa's disciple) secret teachings that were sealed by command seal. Mikyo Dorje used this as the basis for his composition, altered slightly by adding a little bit to it.
There is a commentary on this practice written by the Ninth Gyalwang Karmapa Wangchuk Dorje that is impracticably long. Chakme Rinpoche wrote his commentary because until that time there was no easily accessible commentary for doing Four-Session Guru Yoga. Chakme Rinpoches commentary presents the meditations and visualizations to be done at the various sections of the text. I will go through Chakme Rinpoches explanation of the visualizations first, and then go through the text word by word.
Includes the sadhana of Four-Session Guru Yoga by Mikyo Dorje.