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How do I get pages/posts to use the global widgets?

Make sure the page/post in question has no widgets set. Then, go to the XWidgets Settings page (via the Settings Menu) and Select Use global widgets - When no widgets on page.

How does this work under the hood?

We're using the postmeta and options tables to save the widget settings. We haven't added any tables or columns anywhere. We intercept calls to sidebars_widgets and widget option lookups, and tell them to use the settings stored in postmeta instead of the option table.