This will be useful if you are trying to let multiple people share your computer remotely. If you are trying to set up personal game streaming for one client at a time, try Moonlight and Sunshine (more mature, easier to setup, works on any hardware).

These aren’t rare in the sense that everybody has one they keep as a collectible. If I went down to 7/11 and tried to buy something with it they’d give me a funny look.