PDS

Does anyone out there use the Parish Data Systems (PDS) suite of software? (http://www.parishdata.com/)

We use it at our church to manage all of our parishioner data (specifically, the Church Office application), and were wondering if anyone has ever tried to establish some kind of link between the PDS database and Drupal. Specifically, we'd like to be able to allow parishioners to create accounts on our Drupal site -- but only parishioners. For example, if account creation could be verified against a parishioner listing in the PDS database (or, more likely, an exported set of data from the master PDS database) in some way, that would allow us to know that all authenticated Drupal users are actually parishioners in our church.