NDLR start stop messages

[Darryl]

I believe the intention was that starting any part would send a start, but we'll have to go back and look to see why it's inconsistent. Also, there's nothing in the manual about it, so we'll fix that too. Typically the manual is the "spec" for how things are implemented. Steve will write the manual section before completing a feature as a way to ensure it all makes sense.