If you work at a company with a more than a few computers, you are probably familiar with Terminal Services or Remote Desktop Connections. This is a way to connect to computers (workstations/desktops/servers) from another computer and control them as if you are in front of them.
With Windows XP, Vista, and 7, the consumer version of the operating systems did not allow you to connect to the computer via TS or RDP, but the business versions did. As often happens, people have figured out a way to hack the operating systems so that you can enable these remote connection options on the consumer/home versions.
I can’t say for sure whether these work, but if you are looking for a place to start, try these links: