Let `allPages` be a Federated Wiki page, which in a Lineup will respond with a Ghost page, containing all the pages of the input page(s) before `allPages`.
cf. `Smalltalk allClasses`:
- A Search creates a Ghost with References to pages found in the Neighborhood. These can be dragged elsewhere.
A wiki page is rendered with a translucent background when that page exists only in the browser as a ghost of a page that has been or will soon be.