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

I have a spare laptop and I'd like to use it as a second monitor for my laptop.

Any suggestions on how to do this?

Perhaps if you got a (male-male or maybe it's female-female?) video cable and plugged the output of the primary laptop into the input of the "slave"?

I think I've seen software for this before.

I see at least one solution: http://www.maxivista.com/ ($40)

Clay Nichols
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ZoneScreen 'might' work with Vista if you follow the workaround posted on their website.

Windows Vista and Windows 7 Limitations

These operating systems have two important limitations affecting ZoneScreen display driver. First, due to Windows Display Driver Model (WDDM) architecture, ZoneScreen virtual display driver can't run unless leagcy XP drivers are installed on main video adapter. Also, for Windows Vista x64 and Windows 7 x64 digital signature enforcement for kernel drivers is also applied (ZoneScreen driver do have authenticode signature but appropriate digital certificate costs a lot). So, virtual display driver is not loaded unless this enforcement is disabled.