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This question already has an answer here:

Is there a way to extend my desktop's screen onto my laptop's display, as if the laptop was just another monitor in a dual-monitor configuration?

Maybe with some combination of VNC and Synergy?

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marked as duplicate by ændrük, Kevin Bowen, Alvar, Radu Rădeanu, Basharat Sialvi Jun 21 '13 at 17:31

This question was marked as an exact duplicate of an existing question.

xdmx is really stale, but it was built to do exactly this – RobotHumans Jun 11 '12 at 0:18
Same question on Super User: using a second computer as a mere screen/monitor in X (VNC?) – ændrük Jun 21 '13 at 5:02

I believe with the Nvidia-xserver-settings you can accomplish that provided you have an Nvidia card. You select twinview mode and designate the external monitor as primary and the laptop screen as secondary. That should do the trick.

If you have other graphic cards I am not sure how to do that.

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I don't think that's what he was asking. You can't generally output to a laptop display from an external source, unless maybe some of the HDMI/DisplayPort having cards/laptops somehow allow it. – dobey Jun 11 '12 at 1:07
Ahh I see it now, my apologies, got it wrong the first time – leousa Jun 11 '12 at 1:12

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