RAJA88JP There are several arrangements of wiring to achieve this. In the traveler system, also called the "common" system, the power line (hot, shown in red) is fed into the common terminal of one of the switches. The switches are then connected to each other by a pair of wires called "travelers" (or "strappers" in the UK), and the lamp is connected to the common terminal of the second switch, as shown.|Monster Spageti Terbang