[shortstuffsushi]

I was actually going to reply something along the same lines. These sorts of services exist on both iOS and Android (can't speak to Windows Phone). Not for the provided example, but for Android, the Intents like you mentioned, and iOS has a similar concept for things like "Apps that are capable of routing/mapping" and possibly other things. Neither of these are done through the example "standard prefix," but both are through by adding some standard permission or key to your app.