To answer your question on the mechanics, it's a little complicated. The NTFS file system lets you associate "meta-data" with the files, which includes things like thumbnails for pictures and where it was downloaded from on downloaded files. You can technically put anything in the "meta-data" field for a file, then access it with filename:metadataname. I hadn't thought of doing that on a website, however. I'll think about it and get back to you.