jQuery normally loads pages from the same domain using an Ajax request and then animates the page content into place when the load is complete. This usually results in faster loads (scripts and styles and not loaded again) and a more app-like appearance to you site.
Sometimes it might be necessary to force a complete reload of the page. This will most likely be when the target webroutine uses a different layout and needs to load different script and style resources.
Setting this property to false will force the page to be reloaded without an Ajax request.
For Layout, there is a third option to disable Ajax loading globally. This option would normally be selected when enabling Content Security Policy for the WAM.
See the "Linking Pages" section of the jQuery Mobile documentation for more information on how pages are loaded.
True, False, or Global False