Teleport

eleport is a tool that lets you control several Macs on a local network with just one keyboard and mouse. If you move your cursor to the edge of one screen it will continue its path and jump on to the next. You'll also be able to drag and drop files and share your clipboard on the computers you control with Teleport. The tool shows you a smaller version of your desktops so you can arrange your screens accordingly on either side of your main screen and use the program properly. Additionally, the communication between the shared computers can be coded using a single digital certificate.