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We have a computer in one room connected by cable and a wi-fi modem. Can we move the screen to an other room and leave the modem and computer where it is?

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Technically yes.

What you will need are some really long video, keyboard and mouse cables. You can then run these from where your computer is now to where you want the screen to be.

There is a limit on how long these cables can be (though I'm not sure what it is at the moment - I'll check) but you might be able to get wireless repeaters. However (as @Darakthar points out) that would mean running three cables between rooms and you won't get very far. There are ways of using a single cable but require hardware at either end.

You say you have a wi-fi modem. What sort? Does the computer connect to that via wireless, ethernet or USB connection? If it's either of the first two then you can move the whole computer but leave the modem where it is. Just get a wireless dongle (if you don't already have one) for the computer.

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That way he would have at least three cables running trough his building. I personally would just buy a LAN-Cable which could have a length of up to 50m. This is cheaper and easier than using a very long monitor cable which will lead to a significant decrease in picture quality. I think the maximal length of an VGA cable is between 5-10m. And the picture on the monitor will probably have significant artifacts. You might have a better result with HDMI or DVI though. But the maximal length will be much smaller than 50m for those cables, too. – Darokthar Feb 20 '11 at 23:39
@Darakthar - I know, I wasn't really suggesting that as a solution. – ChrisF Feb 20 '11 at 23:42

Technically Yes. But it's likely cost prohibitive.

You could get a Wireless KVM solution, or a KVM extender that would allow you to combine the necessary cables into a single cat5e network cable. But these devices are not usually inexpensive.

Also, doing so could have an impact on image quality on the monitor as well as video performance.

You'd probably be better off buying a laptop and using that instead.

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Of course! Where are many way to do it:

  1. Set camera with transmitter before screen and use TV as screen in another room/
  2. Connect transmitter to video out of your PC and use TV (or monitor with TV-in) as screen to.
  3. Use a second PC with wi-fi adapter and program such as Remote Desktop or RAdmin / VNC.

First variant is a joke :)

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