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<H2><A NAME="SECTION00335000000000000000">Graphical user interface</A></H2>
<P>
UNIX and Linux don't incorporate the user interface into the
kernel; instead, they let it be implemented by user level
programs. This applies for both text mode and graphical
environments.
<P>
This arrangement makes the system more flexible, but has
the disadvantage that it is simple to implement a different
user interface for each program, making the system
harder to learn.
<P>
The graphical environment primarily used with Linux is called
the X Window System (X for short). X also does not implement
a user interface; it only implements a window system, i.e., tools
with which a graphical user interface can be implemented.
The three most popular user interface styles implemented over
X are Athena, Motif, and Open Look.
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<P><ADDRESS>
<I>Lars Wirzenius <BR>
Sat Nov 15 02:32:11 EET 1997</I>
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