You are allowed to put Chess King on any number of computers you personally own, including when you have a desktop and a laptop, or even if you have a PC with some version of Windows, and also a Mac with a visualization software like VMWare Fusion or Parallels. No need to buy a second copy, you can have Chess King running on both at the same time. In the future we will add cloud services, where you will be able to store your games, analysis, etc. in the cloud and access them in a variety of ways, but it will be through a registration that starts from the serial number, so you should be the only person with your serial number, so you should keep it in a safe place, to avoid 2 people logging in at the same time. Note that this applies for personal ownership of Chess King. Schools or chess training centers with several computers should contact us to get special conditions for multi-computer installations.