I've been thinking about this since I read it yesterday and have more questions. How are you associating the registered user with the db records? When a registered user logs in do they automatically go to their record so that the date last visited is recorded? If so, how are you getting that date without them modifying their record?

Perhaps if you explain the process that you are looking for in detail someone may be able to help you come up with a solution. I'm thinking something similiar has been done but extra fields were stored in the password file as far as updates according to a user's activity?

Unoffical DBMan FAQ

http://creativecomputingweb.com/dbman/index.shtml/