Is parallel switching possible in an AC system practically?

A question was asked for any practical information as I know theoretically it is possible and it was answered quite clearly by "Dean Rubine". 

Question: Is parallel switching possible in an AC system practically? ( as in the picture) 

[www.quora.com/Is-parallel-switching-possible-in-an-AC-system-practically?ch=10&share=c68e9614&srid=BzQhd] 

Answer by Rubine:  Sure. It’s not common but it does have a few use cases. In the posted photo the fans will run when either switch is on; both need to be off for the fans to be off. This is inclusive or implemented with switches.

My wife and I have separate bathrooms with their exhaust fans wired this way. There’s a common exhaust ducting, I think shared with the range hood. A switch in my bathroom or hers will activate the fans. They’re actually timers so the fans don’t run forever. I think they run all the fans at once so the exhaust doesn’t get blown into another room.

In my house growing up (built around 1970) there were a panel of four switches next to my parent’s bed. They were almost always off, but if my mother wanted to turn lights on inside and outside the house in the middle of the night she could just turn all those on without getting out of bed. I’m not sure if they were wired in parallel with other switches in the house, but that would make sense for this application.

We usually aim for exclusive-or when we have a two switch circuit. That way each switch can turn the load on and off no matter what state the other switch is left in. So both switches in the ON position turns the load off.

Exclusive-or uses single pole double throw switches (which have an alternate conducting path in the “off” state) as opposed to a simple single pole single throw switch. Sometimes these days the switches work by sending and receiving digital signals, which is more complicated but more flexible.