Internet IDs.....
Inability to buy or sell, without?
In the hand or the forehead?...figuratively speaking, of course.
“No one could buy or sell unless he had the mark, which is the name of the beast or the number of his name. Here is wisdom. Let him who has understanding calculate the number of the beast, for it is the number of a man: His number is 666.” Revelation 13:17,18