  Quantum electrodynamics under conditions of distinguishability of interacting
matter entities, and of controlled actions and back-actions between them, is
considered. Such "mesoscopic quantum electrodynamics" is shown to share its
dynamical structure with the classical stochastic electrodynamics. In formal
terms, we demonstrate that all general relations of the mesoscopic quantum
electrodynamics may be recast in a form lacking Planck's constant. Mesoscopic
quantum electrodynamics is therefore subject to "doing quantum electrodynamics
while thinking classically," allowing one to substitute essentally classical
considerations for quantum ones without any loss in generality. Implications of
these results for the quantum measurement theory are discussed.
