What do you mean by switch?
I am referring to using the neutral as the breakpoint in a switching circuit. A light is the simplest example. When you flip the switch, your light turns on. Normally this is done by having the switch between the hot wire and the light fixture. This is also the safe and proper way. The problem is, that electricity does not care about you, your codes, your safety, or the proper way to do things. It follows the laws of nature, not the laws of man. That being said, it is physically possible to switch a neutral and achieve the same effect, turning a light on and off.