There you have it! Now, when you launch this shortcut, it will open Chrome into a dummy user account in full-screen mode. Now, this isn't any true security, per se. A simple Alt-F4 will exit the app and give your guest access to your entire computer. However, if the person you're sharing with isn't as tech savvy as you are, it can be just enough to nudge them politely in the "stay the heck away from my stuff" direction.