For the people who don't want to entirely download and install the beta SteamOS read here!

I don't know who wouldn't want to try out the OS beta but there is a trick I found in these forums that would make big picture behave like SteamOS. If you don't know how to do command line arguments I'll try to make this as simple as possible (please note I'm only using Windows 7 as a point of reference so I'm sure other Windows installations work too, I don't know about mac though!)



Exit steam completely, either right click on the taskbar icon and click exit steam or click steam->exit on the client.



Go to your desktop and right click on the steam shortcut on your desktop and click properties



Under Target where it shows the directory and it leads up to Steam.exe then quotation marks, put a space after the ending quotation mark, and paste these command line arguments:

-bigpicture -steamos -testoobe



Next time you launch Steam it'll give an interface like SteamOS and it'll provide multi-user login



There you go, you're now running an equivilent to SteamOS without installing SteamOS, as a bit of verification if you click settings then interface it'll have a check box for "enable linux desktop"



I understand it's common knowledge but I wanted to make it easier to find the information. Also please note that Multi-user login works on steam after you put in those command line arguments. Have fun!



EDIT: There's a disclaimer I must say, this isn't a way to make SteamOS run in windows at the same time, it's essentially big picture with a steamOS command line argument, it shows you what is to come