What is Pendulum Magick?

Pendulum Magick is one of my all time favorite divination tools. I use this several times a week for myself, friends, and family. In your reading, in addition to the questions you request, you will also be given 3 buffer questions of which you ALREADY know the correct answer and I cannot possibly know. Examples of buffer questions would include: "Is my middle name (insert FAKE name here) or something similar.