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This paper presents key aspects of the quantum relativistic direct-actiontheory that underlies the Relativistic Transactional Interpretation. It notessome crucial ways in which traditional interpretations of the direct-actiontheory have impeded progress in developing its quantum counterpart.Specifically, (1) the so-called 'light tight box' condition is re-examined andit is shown that the quantum version of this condition is much less restrictivethan has long been assumed; and (2) the notion of a 'real photon' isdisambiguated and revised to take into account that real (on-shell) photons areindeed both emitted and absorbed and therefore have finite lifetimes. Alsodiscussed is the manner in which real, physical non-unitarity naturally arisesin the quantum direct-action theory of fields, such that the measurementtransition can be clearly defined from within the theory, without reference toexternal observers and without any need to modify quantum theory itself. It isshown that field quantization arises from the non-unitary interaction.

The Relativistic Transactional Interpretation and The Quantum Direct-Action Theory