This has already been mentioned several times in this document, but
in summary, it is a PC running XDM, with a single entry in the Xservers
file, relating to the localhost (i.e. the local machine).
This is usually the default configuration provided by most distributions
'out of the box'.
XDM runs on the application server:
X terminal runs X using a direct query to the application server:
/usr/X11R6/bin/X -query the.application.server
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XDM runs on an application server:
Each X terminal, just runs X, with suitable access control to
permit XDM to connect to it.
It is possible to use a Linux X terminal to connect to another
system running XDM. The same principles as above apply, but
the specifics of configuring XDM (or its equivalent) will be
specific to that system.
You can run X on a Linux box, instructing it to query
a Solaris machine as previously described:
/usr/X11R6/bin/X -query the.solaris.server
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Note that you may have to configure X on the Linux
machine to use the font server from the Solaris box.
Although my Linux box connected and logged in fine without
doing this, the fonts used by CDE were not displayed
correctly.
I have not got this to work yet, as I don't have a
Solaris box that I have any control over - but I am
told that a font entry in /etc/XF86config similar to
the following should work - you may have to change the
port number from 7200 to something else (7100 has been
quoted at me before). Can anyone confirm that this works?
FontPath "tcp/solaris.box:7200/all"
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It is not possible to use X to remotely display Windows applications
on a Windows box. It is possible to use X to display Windows versions
of X applications on a Linux box, using a Windows X Server and Windows
X applications (for example the XFree86 Win32 port -
see Section 7)
It is possible to view Windows applications remotely on a Linux box
using one of the following applications (which don't rely on X or XDM):
Windows Terminal Services (WTS). RDesktop is a Linux application that
understands the 'RDP' protocol used by WTS. This enables Linux to act
as a client to WTS (see Section 7).
Vitual Network Computing (VNC). This is an excellent platform independent
remote desktop system that provides a bi-directional 'Windows or Linux' to
'Windows or Linux' networked desktop. It can be a bit slow, but works
well (see Section 7).
You can actually do quite strange things with VNC, such has having multiple
machines connect and 'control' the desktop (and consequently 'fight' over
control of the mouse :). It also doesn't maintain any
state in the client, so you can leave your client, shutdown, bootup again,
reconnect and carry on from where you left off. There is even a version
of the viewer implemented as a Java applet, usable from any Java-enabled web
browser.
If you have an X server for your system, it should be able to connect
to a Linux XDM application server.
I assume that you would run XDM on the Linux box as usual, and
instruct X on Solaris to query the Linux box - does anyone have
any information on this?
If you have an X server for windows that supports XDMCP queries, then
it should be possible to configure it to query the Linux box. You should
just run XDM on the Linux box as usual.
There are many commercial X Server implementations for Windows, and I will
not list them all here. There is also a port of XFree86 to Windows, that
makes use of the cygwin libraries (used to port many GNU/Linux tools to
Windows - see Section 7). This works well.
The following batch file would start the cygwin XFree86 X server on
Windows and connect to a Linux box (or any OS/machine running XDM),
assuming a default installation of cygwin and XFree86 in c:\cygwin
(save it as xdm.bat):
@echo off
if "%1"=="" goto noserver
goto allok
:noserver
echo Usage: xdm servername
goto end
:allok
set path=%PATH%;\cygwin\bin;\cygwin\usr\X11R6\bin
c:
chdir \cygwin\usr\X11R6\bin
XWin -query %1
:end
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