You don't work with multiple Windows in Metro on a PC. All windows run full screen. You can swipe to get to other apps that you've opened.

>The interface works fine on a phone - my WP7 phone is easy to use with it.
>
>OTOH I'm not multitasking/trying to open multiple windows/trying to do any of thousands of things I've been used to doing in Windows for way over a decade on my phone.