Allow apps to act as data sources for other apps.
Build on WCF to allow on-phone app-to-app communication. This is something that Apple just announced and Google is expected to soon. Get this working ASAP so Windows Phone doesn't get left behind.
Allow JSON and/or XML to pass data between apps.
Use a URI to query apps, ie:
Most importantly! Make apps request permission the first time they talk to a new app, then let it happen in the background. I shouldn't have to launch Facebook just to get to the data.45 votes
In Silverlight it was once possible to register an app as an option for the edit picker in the photo hub (https://msdn.microsoft.com/en-us/library/windows/apps/jj662932(v=vs.105).aspx). This is not possbile for UAP apps.
Another, even better option instead of adding the edit extensibility would be adding an "open with..."-option in the built-in photos app. This option is already present in the desktop variant of the app, but missing in the mobile app.7 votes
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