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Perhaps someone has encountered a similar situation and has a solution. Is there a way to have a virtual screen on a system (like a mirror driver that a VNC client might use, like DFMirage), but that stays on all the time, not just when a remote connection is active.

Basically I have a piece of software that only sends output to second screen on a system where there's only one physical output. If I connect remotely and a virtual screen is established it works, If I disconnect it doesn't.

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Do you have a spare VGA or DVI-I output? I've heard of people making dummy monitor plugs for things like GPGPU work –  Journeyman Geek Feb 4 at 8:14
    
Unfortunately not - it's a small form factor PC with a single HDMI output. –  Joe Feb 4 at 8:47
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This question has been answered here: stackoverflow.com/questions/11922174/… –  user294732 Feb 5 at 2:45

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