In the society of today, keys are an integral factor of life. We all worry about keys and who has control of them. Losing a house key can be a very expensive experience. When a house key is lost, it is necessary to rekey every lock in the house to keep people from gaining entry. We have so many keys floating around. Our children need house keys, the neighbor who takes care of plants and animals when we go on vacation, and perhaps our landlord. How can we restrict who ent