How would you use this? In particular:
- What would you display in the second BD window? Information about the author, series, etc?
- How would you generate the links?
- Would you expect there to be back links?
Taking a guess, these links would be used to show descriptive information. Assume you are in a "books library". The links would point to another library with meta information about the books: author biographies, series synopsis, genre descriptions, whatever.
I think that the link should be a search, not a book id. That would simplify maintenance. If you really want book ids then a search works: id:=nnnnn.
As for setting up the links, clearly you could do it manually (if the feature exists). However, I can imagine using an identifiers-like column for books that would be used by a template to generate links. Example: series:"search query".
Does any of this make sense?