Pass Protected Docs.

I have pass protected files within a directory adequately and included a function that ensures the http_referer is the secured folders index file so that I can be sure the file they are calling is opened up as an include within the index file.

My problem is what if it is a pdf or word doc or pp file. It is a bit of a training directory and they may use various forms of presentations. Now in cold fusion I can control the whole directory by implementing the application.cfm file but I know of no way in asp to do this.