Earlier this year, Steam debuted the beta of their In-Home streaming service which allows you to do what the PS4/Vita and NVIDA Shield/Windows PC are doing, letting you stream your games from home PC to another device via the network. This allows you to run the game on one PC and actually play on another one running a different OS like Mac OS X. When you play a game using In-Home Streaming, video and audio are sent through your home network from your high-end gaming PC to another device in your home. From here, your keyboard, mouse, and controller input is sent back to the remote computer. The downside to this however is if your connection is poor, your framerates will suffer as expected.
For more information, visit http://steampowered.com/streaming