[svlug] esoteric X question

[Robert Hajime Lanning]

two problems with this is bit depth and geometry.  VNC will work best.
Otherwise if the two displays are not identical in this matter the graphics
context will not work properly.

also, setting the DISPLAY variable to the desktop bypasses ssh.  To do the
secure/encrypted ssh X forwarding you must allow ssh to automaticaly set
your DISPLAY variable.  If you have X setup on your desktop and ssh from
it, ssh will use your local .Xauthority file to get the key to connect to
the local X server then it will connect to the remote server and run xauth
to place a new key in the remote .Xauthority file and set the remote DISPLAY
variable to be :10 or something the likes. (depends on how many ssh connections
are forwarding X)  In essence the ssh daemon (sshd or ssh2d) by default will
act as an Xserver and setup the forwarding automaticly when it can.

---- As written by Erik Steffl:
> 
> Jonathan Cobb wrote:
> > 
> > Wondering if there is any way to change the display for an application
> > AFTER you've started it.
> > 
> > Here's an example:
> > 
> > I'm at my desktop computer.  I ssh into some remote box and set the
> > DISPLAY env variable to be my desktop's display.  I can then run X
> > applications on the remote machine and the display goes to my desktop
> > (and securely with X11 forwarding over ssh).  Very common/handy
> > technique.
> > 
> > Problem:  Let's say I leave my office with the X applications still up,
> > and later in the day I'm logged in to another machine somewhere else in
> > the building, far from my office.  I can ssh into the same remote box
> > and start other X apps there, but is it possible to see my applications
> > that are running on the remote box but displayed elsewhere (my
> > desktop)?  In other words, can you change the effective DISPLAY for an X
> > application AFTER it has started?
> > 
> > I haven't been able to find any info on this.  Any help appreciated.
> 
>  obvious answer is vnc, it's not exactly what you want but it's similar
> and you might be able to use it to solve your problem.
> 
>   I think I've read something about some X proxy or something like that
> that bascially sits between app and server and if the server breaks
> connection you can reconnect to the proxy (the application does only
> have connection to proxy so it does not know server connection died).
> don't remember the name but at least you know there is sometyhing like
> that. happy freshmeating!
> 
> 	erik
> 
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-- 
/* Robert Hajime Lanning                             lanning at lanning.cc
** Trade: Unix Systems Administrator (Senior level) (SAGE IV)
*/
#include <std_disclaimer.h>