I know you can do something like "$_server['HTTP_REFERER];" and get the website that the referring link was in. But what if you're using a different protocol What I am trying to do is have a MySQL query run when AND ONLY WHEN a link was clicked from the Furcadia client (which uses the furc:// protocol), instead of a URL being entered directly or someone clicking on a link in a webpage. Basically, the referring URL would be furc://puzzlepalace.

Is this even possible?