  In a recent paper we have introduced a continuous version of the Maxwell
demon (CMD) that is capable of extracting large amounts of work per cycle by
repeated measurements of the state of the system. Here we underline its main
features such as the role played by the Landauer limit in the average extracted
work, the continuous character of the measurement process and the differences
between our continuous Maxwell demon and an autonomous Maxwell demon. We
demonstrate the reversal of Landauer's inequality depending on the
thermodynamical and mechanical stability of the work extracting substance. We
also emphasise the robustness of the Shannon definition of the
information-content of the stored sequences in the limit where work extraction
is maximal and fuelled by the large information-content of rare events.
