On Tue, 5 May 2009, William Shu wrote:
Dear All,
I think I now have a clearer approach to finding solutions to some of my
problems. the suggestions of Stephen, Troy and Miles were particularly helpful.
First, the the solutions obtained so far:
enabling Xforwarding and restarting daemons (e.g., sshd) permits me to have
trouble-free displays over ssh or from xterm windows of different users on the
same console.
From the help offered, I think my solution strategy for multi-terminal display
could be one of the following:
1) Bring up vnc display, have a "master vnc viewer" that can read/write
on the display, and let all the other vnc viewers be "slave vnc
viewers" that can only view the display. Unfortunately, blocking
keyboard/mouse actions using the options menu from pressing the F8
key can be reset by the user. An suggestions to configure vnc to have
such master-slave viewers?
How about something like this from the clients:
vncviewer -via gateway-host -Shared -viewonly -MenuKey 'NoSuchKey'
serverhost:0
In tests here that seems to disable the keyboard input and prevents use of
the F8 menu... (well assuming that you don't have a 'NosuchKey' keysym
available)... Also:
vncviewer -via gateway-host -Shared -viewonly -MenuKey '' serverhost:0
appears to do much the same. Of course if they can connect to the
vnc-server then they could launch a different vncviewer without those
options, but depending on how malicious your users are this may be
acceptable... :-)
(I'm assuming that you want to use -via xxx to do the ssh tunnelling
stuff)...
2) Create a separate account, which can possibly become insecure by
granting xauth authorities, and use vnc to display whatever. While
the implications of extending access (via xauth) frighten, the use of
a video conferencing tool, such as EVO, seem to require internet
access, whereas the machines I'll use are in a closed LAN. Does
anyone know of a video conferencing tool that does not register
to/through the internet?
Once more thank you all for the support.
-- Jon
