[support] Forcing a category on a CCK form

Apologies in advance if there's a simple answer to this, but:

We publish static articles outside of Drupal but would like to give each article a Drupal dicussion area. I've used CCK and the content_taxonomy module to create a new node type that allows for both an article-ID field and a taxonomy dropdown. Is there a way, however, to force a particular taxonomy ID so that, for example, an article on "security" would automatically create a node under our Drupal "security" taxonomy (similar to the way you could do, say ?q=node/add/forum/17 for a forum topic)?

Thanks!

Adam Gaffin Executive Editor, NetworkWorld.com agaffin@nww.com / (508) 490-6433 / http://www.networkworld.com "I programmed my robotic dog to bite the guy who delivers the electronic mail." -- Kibo