Looking around more, it looks like HREF really is/was a Macintosh resource type... but it is still a URL. Basically it's a text track in a Quicktime movie that

Looking around more, it looks like HREF really is/was a Macintosh resource type... but it is still a URL. Basically it's a text track in a Quicktime movie that contains a URL. To make this interesting enough for you guys to read, here it is described in terms of being used as a Quicktime-based exploit! http://www.gnucitizen.org/blog/backdooring-quicktime-movies/ http://www.gnucitizen.org/blog/backdooring-quicktime-movies/