I once went to a Jerry Springer taping while in Chicago.
I cant even remember the topic, but it had your regular fights (once that bell ring, no matter what, start running at each other), and 2 different female guests showed their breasts. I sat near the back though, and I am pretty sure that the first few rows are invited "members" set to ask certain questions. These shows are nowhere near real anymore. All staged. (Probably ever since that Jenny Jones episode where the gay dude got killed after the show for professing his love for a neighborhood dude).
Anyway, I dont remember them telling us who to boo or cheer, but they have producers on the sides of cameras trying to ham up noise of any sort to gas up the guests.