DWM.EXE (Desktop Window Manager) is responsible for desktop compositing, the graphical acceleration of the painting of your deskop in NT6+. In NT 6.2 it is now isolated in a distinct user context. Each session connected user may have a DWM instance in their own distinct user contexts, I haven't checked this yet, but the number at the end of the user name suggests that possibility. I will report more as I investigate. It doesn't really matter in any way to Process Lasso, it is just a curiosity.