How to determine the heir of the living Buddha in Tibet?

When the last living Buddha dies, it will prompt or prompt the birth direction of the next living Buddha ~ Then the Lama will pray for many days, the God Lake will appear or the protector will come down to show the way, and then divination will show the way with other living buddhas. Then, a group that made an unannounced visit to Lama found Lingtong according to the instructions. Sometimes when several children meet the instructions of the gods, they have to identify the relics of the living Buddha in the past, recall the past words and deeds for confirmation, and finally report to the central government to notarize the religious rituals of the selection of the living Buddha and finally determine it.