How to clear single product fpc cache in magento?

I need to link my Magento product to a outside database.?

• https://popmanga.theretailerplace.com . I know its ugly and not user friendly or all the other stuff the gurus say, but its necessary evil do to the nature of my business. I sell books and the product catalogue/hosting is more than Magento and most servers can handle. Plus reintegration of the product database into a another system would cost me thousands of dollars in man power and would all over be a ugly experience. What I would like to do. Is use Magento create a small splashy website on a select group of books. Highly Niche and then link them to my products on my ugly site for sale conversion and payment processing. What I would like to happen is when I click the product you would be redirected to the product of my choosing. Currently my link hierchy on the old site is built on ISBNs and I know how to make the links but I need a place to stick the code to make Magento go to my other database. Any clues?

• Answer:

  There is no way to do this in most cases. There is normally NO external access to any database as it becomes a serious risk to security for the entire hosting site.