Let's say I'd like to have a template for a page that links back to a filter result, in a way that would allow anyone with page permission or page link to see a formatted result of the filter with only selected information, without ever having to actually go into the nation.
In other words, how would I link to each signup in a given filter when using a for loop in a template? Is there a way to link to a filter token? To link to a given list?
It sounds like you want to display some information about people in your database on a public page. You'll want to use a directory page to display everyone with a given tag. You can make sure everyone in a filter has that tag by saving the filter and adding the tag automatically to all who meet its criteria.
Complete and current information on how to use NationBuilder is available in the documentation section.