I'm guessing process exposure could be related to any or all of the following:
Is a process published or not
Is the process or object exposed as a web service
What is the Object Mode (Exclusive/Background/Foreground)
I'm not sure exactly which of these you are talking about (most probably the last one, which is mentioned in the foundation training), but all the above should be things you should probably know about if you want to be an expert in the BP product.
