http://tralvex.com/pub/spiritual/pdf/8ManifestationsGuruRinpoche.pdf
The Dakini Yeshe Tsogyal had a vision in which she saw a
manifestation of Guru Rinpoche called Immense Vajra Ocean in the
direction to the east.
Each of the pores in his body held one billion realms and in
each realm there were one billion w...orld systems. In each of these
world systems there were one billion Guru Rinpoches who each
created one billion emanations. Each of these emanations carried
out the activity of taming one billion disciples. She then saw the
same display in each of the other directions and in the
center.
In this world of Jambudvipa, Guru Rinpoche is known as just one
nirmanakaya who tames beings but according to the different
capacities and giftedness of people he is perceived in various
ways.The history of the Oral Transmission of Kilaya and most Indian
sources explain that he was born as the son of a king or a minister
in Uddiyana; while the terma treasures for the most part narrate
that he was miraculously born. In some texts he is said to have
appeared from a bolt of lightning at the summit of Mount Malaya.
Each of these wondrous stories differ in many ways. This is indeed
a topic that lies far beyond the reach of an ordinary person's
intellect.
http://www.rangjung.com/authors/padmasambhava.htm