Connect CPU to laptop via VGA

Actually there are several ways that work.

1 you could Do Remote Desktop into the Machine.

2. you could use gotomypc.

3. you could use VNC

4. you could use logmein

5. or the ultimate Maxivista

MaxiVista allows you to use the monitor of any spare PC as an extended screen for your Primary PC:

Avoid the hassle of task juggling

Spread windows over both displays to avoid swapping back and forth between overlapping program windows. Your productivity will be significantly increased.

MaxiVista is a smart alternative to an USB monitor.

A new purpose for old computers

Do you have a Laptop, Netbook or Tablet PC laying around, gathering dust while you work on your Primary PC? Why not take advantage of that high-quality TFT display and use it as a second monitor for just a fraction of the cost of purchasing a another monitor? MaxiVista gives even outdated computers new life and purpose.

Use a Mac as monitor, too!

You can now also use a Mac MacBook. MacAir or MacPC as a second monitor for your Windows PC.