The Athena Dialup servers also support running X-Windows applications
remotely.  However, because the dialup servers are often under a heavy
load, you will receive much better performance by running the
applications on an Athena workstation.

To run X11 applications, you need two things:
	-an SSH client configured to forward X11 packets
	-an X11 server running on your local machine

Here is how to connect to the dialups with X11 forwarding from...

... an Athena 9.4* workstation:

	athena% ssh -Y athena.dialup.mit.edu

	* Older versions of Athena may not support the -Y
	  option.  You should use "-X" in place of "-Y".

... a Windows machine:

	Visit http://web.mit.edu/software to install X-Win32
	and SecureCRT.  Launch X-Win32, and close any dialog
	boxes which may pop up.  You can verify that X-Win32 
	is running by the presence of an "X" icon in your 
	system tray.   Launch SecureCRT, and right-click on
	the "Athena" profile.  Choose "Properties" from the
	right-click menu, and locate the "Forward X11 Packets"
	checkbox.  Ensure that the box is checked, and then
	save your profile changes.  You can now connect using
	the Athena profile and use X11 applications.

... a Mac OS X machine (10.4 - Tiger or higher):

	Launch the "X11" application in /Applications/Utilities.
	If you do not have the application installed, you will
	need to install it using the CD or DVD that came with your
	current version of Mac OS.  Once the X11 application opens,
	it will open an "xterm" window with a shell prompt.  At
	that prompt, type:

		ssh -Y username@athena.dialup.mit.edu

		replacing "username" with your Athena username
	
	Mac OS X 10.3 users must download X11.app from the Apple
	website, and must use "-X" in place of "-Y" in the previous
	command.


To verify that you have successfully enabled X11 forwarding, you can type
this command at the Athena dialup prompt:

	athena% echo $DISPLAY
	
It should return something like:

	localhost:17.0

If the number to the right of the colon is 10 or higher, you have
successfully enabled X11 forwarding.  If you get a blank response or
"undefined variable", you should double-check that you configured X11
forwarding correctly.  NOTE: You should NEVER set the DISPLAY variable
by hand -- doing so can leave your session open to eavesdropping or
interception.  
	

$Date$