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You mean a text in a special paragraph or field of live _template?

That would be the easiest way - using a live _template of the category describing the fields on the page. Than ylou can always decide which field is displayed on the
List form output.

A text stored on a second page ( like task category or similar) "task:original-pagename" which can be easyly found by linked tags or childhood/parenting or simple by exchanging page names would only work for the display of a single page with his text. ( look at http://genealogy-template.wikidot.com/ as an example by linking different pages to a big page together)
The reason is that ListPages modules cannot be inserted in another.