ISSUE: Messaging pattern descriptions

[Mark Taylor]

Sections 2.5 and 3.9 currently talk about the same thing 
(Notify/Synch/Asynch patterns of messaging).  This looks a bit redundant,
but the intention is to provide a high-level overview in the Overview
section while deferring the nuts and bolts to the more detailed section
which appears later.  Is this reasonable or should the discussion be
collapsed to just one section (and if so where?).

-- 
Mark Taylor   Astronomical Programmer   Physics, Bristol University, UK
m.b.taylor at bris.ac.uk +44-117-928-8776 http://www.star.bris.ac.uk/~mbt/