The Kwin reference article from the English Wikipedia on 24-Apr-2004
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Kwin

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Kwin is the KDE Window manager. It is dependent on KDE and KDE is very dependent on it. It has gone through three revisions.

Table of contents
1 Kwin_I
2 Kwin_II
3 Kwin_III
4 Look and feel
5 Configurabillity
6 Integration

Kwin_I

Kwin_I was actually known as kwm, and was part of the KDE 1.x series

Kwin_II

Kwin_I was the second version of Kwin. It came with KDE 2.0. It was a major improvement over Kwin I. Most notable was its extended support for themes and window effecs

Kwin_III

Kwin_III is the latest version of Kwin. It debuted in KDE 3.2 and has improved support for the extended icccm standards from freedesktop.org

Look and feel

Kwin has a large range of Look and feels. There are currently over 100 styles for it. Some popular look and feels include Keramik (default since KDE 3.1), Redmond (Windows 95/98/2000 style), and Plastik (Popular theme that debuted in KDE 3.2)

Configurabillity

Kwin is often seen as a meta-window managerm a window manager that can emulate other Window managers. With over 5 configuration tabs in Kwin_III, the choice is vast. From focus style, keyboard shortcuts, virtual desktops and more

Integration

While Kwin can work on its own or with other desktop environments, Kwin is optimized for KDE. It is a transparent part of the KDE interface and together with other parts such as the panel and the desktop, it makes up the combined KDE user environment.