Take a look at this documentation, which should help:
http://msdn.microsoft.com/en-us/library/windows/apps/bg182890.aspx
An app can launch another app. When this happens, the two apps typically split the screen evenly if there's enough space. But you can change this so that the launched app is wider or narrower than the original app, or so that it even replaces the original
app on the screen. To change the default behavior, use the
DesiredRemainingView property.
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