Use iMac 21" as screen for Vista PC

Hi everyone,
I recently purchased a new iMac 21" all in one unit. However I still have my Vista machine, and would prefer to keep both machines going.
Is there a way where I can use the iMac screen for the Vista machine. I know I will most likely need to purchase a new video card or something for the vista machine to do this, but I would like to know is it possible. If so, what do I need???
On a side note, I really don't think this is possible, however if I was to connect the vista machine to the iMac either via ethernet or router could I have a speedy way of complete control, therefore removing the need for 2 keyboards and 2 mice on the desk.
I have a fairly small house so space is limited hence why I would prefer not to buy some huge desk so both machine can fit on it.
Thanks in advance.
Trent

tandt2 wrote:
Thanks Stefan,
Forgive me for being a complete noob here....
So the best way for me to achieve what I am wanting to do is to connect the two machines via my router (faster then wireless for me) then run a VPN plus some type of remote control program (i am assuming that is a VNC?).
VPN http://en.wikipedia.org/wiki/Vpn would only be needed if you use the internet to connect the two machines for the sake of security.
VNC http://en.wikipedia.org/wiki/Vnc would suffice if you can connect the two machines through your own home router.
The machine that you want to control remotely has to run a VNC Server, whereas the machine that controls the other runs a VNC client.
OSX has the needed software already included. It's called Screen Sharing.
Have a look at the OSX help for it.
On the Windows machine you would need a VNC Server program.
UltraVNC or TightVNC are free open source programs for that.
I have seen programs like VMware Fusion? would this be any good?
Fusion is a completely different app.
It enables an Intel-based Mac to run Windows (or other operating systems) alongside OSX by providing a 'virtualized' environment in which Windows is installed and runs.
It removes the neccessity to have a second Windows computer.
http://en.wikipedia.org/wiki/VMWare_Fusion
Thanks again
Trent
Hope it helps
Stefan

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