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Can I use my laptop as a second monitor for my desk computer?

I have a working laptop (laptop A), but am interested in using the laptop's LCD as a secondary monitor for my main laptop (laptop B)...is there a way to do this via software or cabling without modifying laptop A? OS's are Windows XP SP3 and Windows 7.

Update: Software must be free, and a bonus if I can switch between using Laptop A as a secondary monitor and its regular desktop.

marked as duplicate by Tamara Wijsman, studiohack, BloodPhilia, Sathyajith Bhat, Ivo Flipse Jan 31 '11 at 10:00

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    take a look at x2vnc and win2vnc. i just ran across them today, so i don't know for sure, but it sounds like that will do the trick. – quack quixote May 6 '10 at 22:15

There are options to make this happen: Here's a similar question with some ideas: Use an old laptop as a monitor?

  • @BBlake, MaxiVista is not free, and ZoneOS looks interesting...however, ZoneOS does not seem to be compatible with Win7 quite yet... – studiohack Apr 9 '10 at 17:38

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