> The `trail` part is *both* a performance hack, and a way to select pages. I have over 5000 pages on my site, I need all the performance hacks I can get.
> For the performance hack, it is a way of reducing the need to iterate through every single page in the wiki in order to find matching pages.
> For the way-to-select-pages, yes, it is intended to be similar to [[todo/wikitrails]] and [[plugins/contrib/trail]] (and will be more similar with the new release which will be happening soon; it will add prev_* and next_* variables).
> The idea is that, rather than having to add special "trail" links on PageA to indicate that a page is part of the trail,
> it takes advantage of the `%links` hash, which already contains, for each page, an array of the links from that page to other pages. No need for special markup, just use what's there; a trail is defined as "all the pages linked to from page X", and since it's an array, it has an order already.
> But to avoid that being too limiting, one can use a `pages=...` pagespec to filter that list to a subset; only the pages one is interested in.