Very useful document. We need more scenarios / recipes documents like this one to pull the work of various groups 
together, or show how a specification fits into the standards space. This will also help to identify gaps in the 
standards space. Further, it will motivate implementers in the uptake of these specifications, as they begin to see how 
they can be knitted together. Good work.

I would strongly encourage that the target readership of such a document is widened. To do this, you must give more 
introduction. What is required is a brief introduction at the start of the document, to each of the specifications (
couple of paragraphs each) that are used in the scenarios, i.e. BES, JSDL, CDL, ACS. Also would be useful to give a 
brief introduction to the concept of an "activity". Keep it as short as possible.