David has provided a thorough "parsing" of his definition of heat.
I believe it may amount to what I wrote on October 28 in the
"ENERGY WITH Q" thread":
"Any energy change in a system that is associated exclusively
with an alteration in the occupation numbers (rather than the
energy levels) of the allowed quantum states *will* alter the
entropy of the system and ought, therefore, to be considered
'heat.'
"Any energy change in a system that is associated exclusively
with an alteration in the energy levels (rather than the
occupation numbers) of the allowed quantum states will *not*
alter the entropy of the system and ought, therefore, to be
considered 'work.'"