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The Window Manager

The window manager is responsible for manipulating windows on the screen. The window manager performs the following operations:

This task of controlling the window environment is not easy and has many facets.

For instance, there may be multiple applications running simultaneously and a conflict for input may arise:

does a keyboard input go in a window where the mouse currently points or must a window be explicitly chosen.

The appearance (look and feel) of a window manager varies a lot (compare OPEN LOOK and MOTIF window managers to see this).
Tue May 24 16:52:56 BST 1994