Blackout local screen

[David W. Chapman Jr.]

What's really wierd is that I've run pcanywhere and vnc and the same time,
turned the screen blanking on in pcanywhere and the vnc screen still worked.
I couldn't click on anything in vnc, but it still appeared to blank the
screen.

----- Original Message -----
From: "Peaks, Jeremy (DN=M164210, ITD, GUILDFORD, MAFF)"
<Jeremy.Peaks "at" maff.gsi.gov.uk>
To: "'ou1=SMTP;o=MAFF;p=MAFF400;a=ATTmail;c=GB;dda:RFC-822=vnc-list(a
(Receipt Notification Requested) (Non Receipt Notification Requested)"
<vnc-list "at" parker2.maff.gsi.gov.uk (a)>
Sent: Thursday, June 01, 2000 5:38 AM
Subject: RE: Blackout local screen


> 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:
> ou1=SMTP;o=MAFF;p=MAFF400;a=ATTmail;c=GB;dda:RFC-822=owner-vnc-list(a)uk
> .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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