  In the dissipationless measurements of Landauer et al., measurement still requires the development of correlations between physical systems, through interaction. The demonless engines of Popper et al. indicate that the only physical aspect of this process that is relevant is precisely this correlated interaction, and that the question of whether the interaction is for the purpose of information gathering is not, in itself, of significance. While advocates of the information theoretic approach might argue that the correlation is information, the arguments of Maroney and of Shenker and Hemmo would appear to challenge whether maintaining this correlation is even necessary to understand the operation of the engine. It may be asked whether the characterisation of the correlation as “information” is actually playing any role, or whether this is just a trivial relabelling exercise? If the term information adds nothing to the understanding of statistical mechanics then it could be purged from the description (of course, this still leaves open the possibility that statistical mechanics has non-trivial implications for the physics of information processing).