Ok here is what I want to do, it seems to me like it should be pretty easy technically but for the life of me I can't seem to find any info on how one would go about doing it.
So the basic idea is this. I have a website, URL unimportant. I have roughly 15 pages on this site, I would like the first page to viewable to the public with NO restrictions at all, somewhere down the bottom of the page or anywhere I want on the page I would like a little box where a CODE of some sort has to be entered so that once the surfer enters that CODE the rest of the site is viewable to them.
I want to be able to change the code at my whim, so it's not passed around and it would be great if there was a place I could see what codes have been entered how many times etc..
This way I can track how my marketing is going based on what codes are entered...
It really does sound simple, any ideas? Or can someone point me in the right direction to learn how to do this?
Thanks in advance.