Hope someone can help on this!

I have been charged with revamping the online presence for a magazine. Aside
from the public access for the site, there also will be pages that require
subscription. This gateway, as well as registration, is handled by our
subscription service, then the user is referred back to the exclusive content.
While this works fine, any savvy individual can get around this if they know
the URL of a specific page. My contact at the subscription service recommended
a cookie or other variable that refers users back to the logon page. How
difficult is this to do within DW, and what is required?

Thanks!