This was copied from Wikipedia in the Vajrayana area of Prostrations:
...Bring your hands together in the 'lotus bud' mudra (the base of the palm and the fingertips together, and thumbs slightly tucked in) and place them on the crown of the head, then to the throat and heart. As you place your hands on your crown, you offer homage to Guru Rinpoche's enlightened body, purify defilements and obscurations incurred through the avenue of your body, and establish the potential to realize nirmanakaya. At your throat, you offer homage to his enlightened speech, and establish the potential to realized sambhogakaya. Bringing your hands to your heart, you offer homage to his enlightened mind, purify your mind's obscurations, and establish the potential to realize dharmakaya. The actual prostration is performed by dropping the body forward and stretching it full length on the floor, the arms outstretched in front.... Again, with hands in the lotus bud mudra, bend your arms back and touch your hands to the top of your head, a gesture that acknowledges the blessing flowing from Guru Rinpoche. Then stretch your arms out once more and push yourself up.... Bring your hands into the lotus bud mudra for the third time and touch your heart in a gesture of reverence. Then, with a smooth motion, bring your hands to your crown and perform the next prostration...
Kindest wishes, Dave