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A lot of the guides for developing Windows Store apps talk about an event log where you can see information from the apps – this is of special importance for those doing background processing, live & secondary tiles. In the documentation it is either called just TWinUI or it is called Microsoft-Windows-TWinUI, however you may battle to find that in the event viewer since the group it is in, is not named that.
To get to it go to
And you will find it inside that group! Happy debugging.