Orchestration & Choreography

is there any difference in the two words??? i always used them interchangably when i was talking to anybody randomly blurting out any one of them. but atleast in the context of webServices there seems to be difference b/w the two. i was browsing the oracle magaZine(which i came to know has got some award which is the equivalent of an oscar in the publishing world) and they have highlighted a pretty subtle but important difference. Orchestration according to them is when u talk about how ur going to tie together multiple webServices(create a workflow) to produce a consumable, composite, larger functionality oriented webServise. Choreography is when one is talking about how different businesses can define which message eexchange patterns they will engage in before implementing there corresponding internal processes. the main difference clearly is that in the former case everything is more or less under ur control while in the latter it aint.