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Is it possible to use one PC, and output two different desktopd with different activity? Such as below:

     One PC
       |
 -------------
 ^           ^
DVI          HDMI
^              ^
\               \
 Desktop 1      Desktop 2
  |                |
  Youtube          > Presentation -> LCD Screen 2
  |                > No audio, display only
  > LCD Screen 1
  > Video/Audio
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Extended desktop does't work for you because…? – Daniel Beck Oct 2 '11 at 17:00
Do you want to be able to move windows between them - or do you want seperate X sessions? – new123456 Oct 2 '11 at 17:02
I can not share Desktop 1 with Desktop 2. Because Desktop 2 is a touch screen. and Desktop 1 is advertising screen/sliders/display. – YumYumYum Oct 2 '11 at 17:05
@DanielBeck: Display 1 will have resolution of 1080i (no inputs), and Desktop 2 will have 1024x768 with touch screen to take commands. – YumYumYum Oct 2 '11 at 17:19
You wouldn't share. Read this. Second paragraph. See example arrangement here. This is how you connect a large screen to a laptop computer and stay sane. – Daniel Beck Oct 2 '11 at 17:32
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I have a similar setup where I through the nvidia driver have two screens defined through TwinView in the X window manager. One for console access and one for TV output. By manipulating the DISPLAY variable I can decide on which screen programs should do their output to.

In your case you would set the DISPLAY variable to ':0.1' (if LCD Screen 1 is the default display) before running the presentation software.

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