webpedia: A dual-screen hack for Windows: "Wednesday, January 11, 2006
A dual-screen hack for Windows
Win2VNC will open a small (one pixel wide) window on the edge of your screen. Moving the pointer into this window will trigger the program to take over your mouse and send mouse movements and keystrokes though the RFB protocol to a VNC server running on another machine. When the pointer is moved back towards the opposite edge on the other screen, the mouse is returned to your primary display."