Blackout local screen

[Jonathan Morton]

>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.

Sounds like pcAnywhere uses something along the lines of either
gamma-fading or DPMA-blanking the screen, both of which would disable the
physical monitor but leave the video memory unaffected.  I don't think
gamma-fading is available on most PC-based video cards, so DPMA sounds like
the way to go.

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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.
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