Blackout local screen

[Peaks, Jeremy]

Presumably once a connection has been made with local keyboard and mouse events disabled, then a user could not get the monitor back on just by moving the mouse or pressing a key?

If this is the case then this method might just work!  I'll give it a go.

Jeremy Peaks

-----Original Message-----
From:
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.research.att.com; 
Sent: 01 June 2000 11:40
To:
ou1=SMTP;o=MAFF;p=MAFF400;a=ATTmail;c=GB;dda:RFC-822=vnc-list(a)uk.resea
rch.att.com;
Subject: Re: Blackout local screen


>I noticed in the history that disabling local keyboard and mouse events
>has been implemented into VNC now, for NT machines.  Are there any plans
>to implement a blackout local screen function in the same way other
>products such as PC Anywhere do?  The reason I ask is because we are
>concidering using VNC to give us remote control over NT servers scattered
>around the country, but we do not want the scenario where a user is in the
>same room as the server and see's everything that is happening.  Such an
>event would cause a security risk.  Any ideas?

On a Mac, it would be possible to do this using the "gamma table" built
into Mac graphics hardware.  Under Windows, the situation is likely more
complex.  Simply blanking the screen is impossible in both cases, as VNC
has to grab what is on the screen.  A possible workaround might be to
activate the DPMA power-saving features built into most recent monitors?

--------------------------------------------------------------
from:     Jonathan "Chromatix" Morton
mail:     chromi "at" cyberspace.org  (not for attachments)
uni-mail: j.d.morton "at" lancaster.ac.uk

The key to knowledge is not to rely on people to teach you it.
--------------------------------------------------------------
Contributing to the VNC Project - http://www.uk.research.att.com/vnc/
Macintosh VNCserver v3.3.2 beta2.3 now posted at:
	http://chromatix.autistics.org/vnc/
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