What is the other name for staircase wiring?

I've seen it called "hallway wiring".

The idea is the same in both cases . . . there's a switch at both ends, and either switch

can turn the light on and off, regardless of the position of the other switch.

That way, a single person can turn the light on at one end of the hallway or staircase,

walk up the stairs or through the hallway, and turn the light off when he reaches the

other end.