This is a high level question.
We are going to be reviewing our current system architecture and a little
bird, a good friend of mine who is one of the most knowledgable SQL Server
MVPs I know, told me I should take a look at Service Broker. Well I have

I have successfully setup Login Auditing using Service Broker, but have an
application that tries to login using invalid characters (猀愀). 2 empty
squares.
I have been unsuccessful in trapping this as an error in my Stored Proc