x2x is a software alternative to a KVM switch
Unless you have fully embraced the virtualization movement, you probably have more than one machine in your home or office, particularly if you run more than one operating system, and you probably have more than one keyboard and mouse on you desk. If you would like to regain some desk space without having to purchase a KVM switch, x2x may be the solution. Simply put, x2x takes advantage of the X Window System's ability to run a display over a TCP/IP network. In this case, you are not running a display as much as you are taking charge of another display's mouse and keyboard.
You can run x2x over SSH, which is easy and secure, or connect x2x directly to the remote X server. The second method is a bit more difficult because it requires some reconfiguring of your X system, but it gives you the ability to cut and paste between the systems. If you want x2x to be as secure using the second method as it is with the first, you have to resort to SSH port forwarding, which may be difficult because x2x does not use a consistent port on the primary machine. In either case, the machines that run x2x have to support the XTEST X Window extension. Most Linux distributions do; to see if yours does, run the command xdpyinfo | grep XTEST in a terminal. If you get any response, you are over the first hurdle.
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