If you're willing to go to VNC, I'd guess that one or more of the addons
listed here might do what you need:

http://dcs.nac.uci.edu/~strombrg/vnc.html#addons


If that doesn't have quite what you need, you may be able to use some
form of VNC proxy in between your Xvnc and your student's vncviewers,
and then kill -STOP and kill -CONT the Xvnc as needed, with the proxy
handling screen refreshes for the vncviewers.

On Tue, 2005-04-05 at 15:41 -0700, Robert Padjen wrote:
> Love K12LTSP, but the teachers I am demoing it for
> really want a feature in the lab (20 machines
> proposed) environment that I'm certain has come up
> before, but I cannot for the life of me cannot find -
> perhaps an option to ltspinfo...?
> 
> The idea is to freeze/pause the remote clients (or
> student accounts) so that the teacher can instruct,
> then allow the students to continue, then get their
> attention quickly again, then allow them to resume. A
> global shutdown is too time consuming - I'm thinking a
> centrally administrated screen saver...
> 
> Thoughts? Thanks.
> 
> 
>               
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