Might as well be the same thing. I went to a taping of a sitcom a few years back, and they most definitely instructed the audience when to laugh and have other reactions. Each segment of each scene may be shot several times, so I guess they needed to keep the laughter up even when the audience is hearing a joke for the fourth time. There was a host of sorts to entertain the audience in between takes, and he'd say things like "now remember, when Joe enters the scene, make sure you sound surprised." Similarly when I went to live Canadian Idol and Battle of the Blades shows, the stage manager has the audience practice cheering before the show begins, reminds everyone in commercial breaks, and even encourages the audience to boo when they don't like what the judges say. For Canadian Idol, they also had coloured boards and markers so that people could make signs and banners on the way in.