SharePoint 2010 Variations: Enable and Disable On-demand Page Propagation
https://blogs.msdn.com/b/ecm/archive/2010/06/22/variations-propagate-pages-on-your-terms.aspx
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https://blogs.msdn.com/b/ecm/archive/2010/06/22/variations-propagate-pages-on-your-terms.aspx