Inter application communication in WinRT

Question

There are two WinRT applications (C#/Xaml if it matters) on Windows 8. The first app should receive and send some data into the second one. What the best way to do that? Can WCF

Answer 1

Not possible, this requires loopback support. Something you can only turn on for testing, you cannot rely on it on your user's machine. The CheckNetIsolation.exe utility is available to enable it, MSDN article is here.

Emphasis on only for testing, you can't ship an app like this. Your authentication server needs to run on another machine. Pretty essential anyway considering the odds it will be compromised when it runs on the same machine.