Clicker training is wonderful, it fully engages the dog in the learning process. You certainly can have a class full of people clicking, the dogs have no trouble hearing "their" clicker. A clicker is just a way to mark behavior, clicker training is a whole way of training. In a nutshell, we get the behavior first, then tie a command to it. With puppies clicker training has to be seen to be believed. If there's a class in your area, do go see it, you'll be amazed.
http://www.clickertrain.com/journal.html