Source: http://www.engadget.com/2015/01/16/access-everything-on-your-chromebook-through-another-pc/
Which device can't you access your Chromebook from? Until now, the answer was any other kind of PC, but even that's not true anymore. Sure, your Windows laptop or MacBook might be capable of more than a cheap Chromebook, but now, as long you've got Chrome installed on it, you can access anything you're keeping on your Google-powered PC. You were already able to do the opposite with Chrome's Remote Desktop app, which is arguably a whole lot more useful, but this development could prove a good way of offering tech support to less tech savvy types. You'd probably still have to help your friend / family member out but getting them on the Chrome OS developer channel first -- a requirement for the currently experimental feature.
Source: Chrome