Remote operation question

I'm posting this under networking since my application falls under my home network.

I'm very good with computers and have made a living for awhile doing tech work for residential, but I admit when it comes to things like VNC, I am as brainless as a rock.

I just finished setting up a Windows box so I can run a couple programs that aren't made for anything but Windows (and I fully guarantee there are no similar programs for these). I run dual screen on my eMac, and can't stand to go single screen and would like to remote the Winbox from my Mac.

How would I go about setting this up? I know I can use Teamviewer, but it's kind of redundant to use an across-the-internet program for something in my own home office. Is there something I can use for my local network?

P.S. Yes, I know I could also use a usb-kvm, but I have enough cables running around as it is.....I'm hoping to reduce clutter not add to it.