4Dwm is the window manager component of the IRIX Interactive Desktop included on Silicon Graphics workstations running IRIX. 4Dwm is derived from the older Motif Window Manager and uses the Motif widget toolkit on top of the X Window System found on most Unix systems. 4Dwm refers to "Fourth dimension window manager" and has no relation to dwm.
4DWM possesses similar features and function to its sibling, Common Desktop Environment, used on many other UNIX systems in the 1990s and early 2000s.
It is a stacking window manager managed by .Xdefaults, including features such as click to focus and mouse focus options. It supports themes, extensive modifications, font changes, window customization and more.