In looking through the comment thread, there is a commenter "P.L.M." who's making a number of solid comments.
PLM may refer to:Chemins de fer de Paris à Lyon et à la Méditerranée (PLM), a French railway companyPamantasan ng Lungsod ng Maynila (PLM), University of the City of ManilaPartido Liberal Mexicano, a pre-1910 Revolution Mexican political partyPeriodic Limb Movement DisorderPL/M, a computer programming languagePlant lifecycle management, the process of managing an industrial facility's data and information throughout its lifetimePolarized Light Microscopy, a form of microscopyProduct lifecycle management, the process of managing the entire lifecycle of a productClosed Loop Lifecycle ManagementProduct life cycle management (marketing)Sultan Mahmud Badaruddin II Airport (IATA airport code: PLM), in Palembang, IndonesiaIndonesian for perahu layar motor, a traditional type of lambo (boat).Planar Lipid Membranes, a kind of Lipid bilayerA Payload Module on a satellite or spacecraft, such as the SOHO Payload Module (PLM)
P.L.M is a mysterious character. Comes then goes. Comes again then goes again then comes again. I can only speak for myself of course but I always prefer he/she/its coming rather than going; does the cause of solid comments much good.
Whoever PLM is, I had to wander into the Confessional OutHouse and personally commend him/her as well as RubeRad.