Originally Posted by j77
I've never seen a 3 way, only 2 way and intermediate
I don't know if you are in the US or not, but I am and I've never heard of a 2-way or an intermediate?
The switches that we would use in a residential setting would be a SPST, a 3-way (SPDT) or a 4-way (DPDT)
Entrance: 2, 3-ways
Halfway: 1, 3-way for entrance and 1,4-way for hall
Far End: 1, 3-way for hall