Computing is any goal-oriented activity requiring, benefiting from, or creating computers.
A widget toolkit, widget library, GUI toolkit, or UX library is a library or a collection of libraries containing a set of graphical control elements (called widgets) used to construct the graphical user interface (GUI) of programs.
Window Maker is a free and open source window manager for the X Window System, allowing graphical applications to be run on Unix-like operating-systems.
In the X Window System, an X display manager is a graphical login manager which starts a session on an X server from the same or another computer.
The X Window System (X11, or shortened to simply X) is a windowing system for bitmap displays, common on UNIX-like computer operating systems.