Nathan is right, the clickers are only to make the bears aware of your presence. Yes, they are the ones used to train dogs. The theory is that they don't sound like anything else. They aren't very loud and they won't intimidate a black or brown bear. They could, however (just like yelling "Hey Bear") alert a bear to the fact that you are getting close. In Grizzly country, that is probably the most important thing (many a Grizzly attack report starts with "the hiker surprised the bear...").
To chase off a black bear, I've always just made a bunch of noise (clanging on pans, etc.). A group of people making a bunch of noise works even better. Black bears seem to be a bigger problem in car campgrounds than in remote places, so finding folks to join in the bear chasing activities should be easy (if you are at all concerned). In Grizzly country, I always carry bear spray (although I've never used it).