Email discussion:

> Section 4.3.4.  Please be consistent also about the use of RAO Value 
> vs. NSLPID.  (What is their relationship to one another, also needs to 
> be defined.) The first paragraph in this section uses NLSPID, while 
> point 1 immediately following uses RAO value and NSLPID.)

See the end of 4.3.1; this defines the relationship. The point here is that,
semantically, only the NSLPID is significant in deciding whether to process a
message; however, the RAO value can affect whether or not a message will be
intercepted in the first place.