Choreographed vertices follow keyframed animation - they're not included in the cloth dynamics calculations. So if you animate a prop before (or after, doesn't really matter) setting up a cloth simulation, the vertices you assign to the choreographed group will move as directed by the keyframed animation. I've used choreographed vertices for scenes where a character plucks the hem of her dress. I moved/scaled/rotated the complete dress in frame 20 until the two vertices that I designated as choreographed were at the exact location I wanted them. Then I calculated the simulation - the plucked part of the hem neatly moved to the location where I wanted it, the rest follwed neatly. Constrrained groups follow the closest polygon of the objects they're set to collide with.

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