Basically what it does is that Steam users will just need to install the client on their computer, adjust the amount of bandwidth they’d like the stream to consume (in case there are other people at home who need the internet as well) and they’re good to go. This could be a particularly useful feature, especially for those who might have laptops that might not be powerful enough to play certain games, or where it might get too hot if intensive graphics are required. By streaming games from a PC to a laptop, for example, it would require less computing power compared to rendering the graphics on the laptop itself.
Valve admits that one of the drawbacks to the perform of their streaming service, versus something like Sony’s PlayStation Now where everything is done in the cloud, would be the host network. No word on when Valve will launch their service to the public, but if you’re interested just hit up Valve’s website and sign up for the beta.