TuningProfile

Hi,
 
I've got a bunch of questions about tuning profiles. I'll send each in a
separate message to keep things simple. This is the first :-)
 
I'm writing a SASL/DIGESTMD5 tuning profile and am trying to work out
how TuningProfile is supposed to be used. It has a bunch of methods
(begin, complete and abort) that none of the exisitng tuning profiles
actually use - in fact SASLAnonymousProfile says it uses them, but it
doesn't.
 
TuningProfile also has an implementation of startChannel - am I supposed
to call that from my own implementation?
 
- Paul Andrews