Xwindows

X-windows is a standard for displaying application User Interfaces on a remote dislay. It uses a client/server model with following components.

X display server	Where the display is (Xserver, Exceed, ReflexionX, Viewnow)
X client	The application to be displayed (e.g. xterm).
Windows Manager	The application on the server managing the user session (CDE, Gnome, KDE). Buttons, icons, window borders are part of the window manager.
Fontserver	Server which provides the display server with the correct fonts for the application.

DISPLAY

Variable pointing to where X should put its windows. It has the form:

<Address>:<display>.<screen>, Usually
<hostname>:0.0

A client system can run several X-hosts with different display
numbers. Display can consist of more then one screen.

xev

Opens a window, all events in this window (eg keystrokes) are dumped to
stdout.

Look in /usr/X/demo

Tips and Tricks

 

xterm

Start an X-windows terminal. A terminal started from an X-windows manager session does not start the shell as an interactive shell automatically. This means it does not invoke /etc/profile. In gome-terminal you should select ‘Run command as a login shell’ in the ‘Title and Command’ tab in the current profile.

kdeinit

KDE process launcher. Sometimes launching programs in KDE report: “Cannot talk to klauncher”. This can be fixed by restarting the thing:
# dcopserver_shutdown
# kdeinit
Additionally you may need to remove all .DCOPserver_* file in your home directory just before starting kdeinit.