How to setup a slide to show if all other slides have been viewed?

Thanks for the quick response Ashley,

Sorry - I'm not understanding your question - how are you going to have them send that info......

Lets take a step back and simplify things, I have a stand alone course & this is what I want to accomplish:

On the last slide of the course, if all the slides have been viewed, I want to show a message (Hey, thanks for taking this course, you are done)

If they have not all been viewed I want to show another message (Hey you have not viewed all the slide) 

How can I do that?  (I'm looking for any solution here)    

Locking down the nav is not really an option, b/c users can go back to the course for reference.

Thanks for your help!

Rob