click here - download the free edition and install on both machines. Connect them up with an Ethernet lead (you can do it straight from one to the other without a router, I did this at work). Get the tower's IP address by going to Start, Run, type in cmd and press Enter. In the Command prompt, type in ipconfig and press Enter. The computer's IP will come up, it should be something like 192.168.1.2. Go to the laptop, start up VNC viewer and put this in. It will then connect to the tower and you can view it's screen and also control it.