I believe that tags will help me do something I do not now know how to do.

What URL do I send to someone to display just my BY remixes?

What URL do I send to someone to a page which displays all mixter BY remixes?

same questions, but to display instead both BY and sampling plus.

In other words, is there a way to use tags to send an answer to a fellow who asked for a list of my non-NC mixes?

The easy, quick way would be to use the remix “browser”. Then save as a playlist for a static url. : )