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Desktop Window Manager. For the X Window System window manager, see dwm. Desktop Window Manager (DWM, previously Desktop Compositing Engine or DCE) is the window manager in Windows Vista, Windows 7, Windows 8 and Windows 10 that enables the use of hardware acceleration to render the graphical user interface of Windows.
Thus, 'Dum-dum' came to mean a jacketed bullet illicitly or illegally modified to expand. This seems to be the most common current usage of the term - a dum-dum is usually taken to be a bullet which has been modified by the user in order to create greater injury rather than a factory produced hollow-point or soft-point round as might be chosen for hunting or law enforcement purposes.