Thanks again. We're talking about less than 1000 records and the update frequency isn't of the highest importance. This strategy would not work in a transactional business situation.

The main reason for the question is to display a list of current system users. My security model allows for limiting the number of concurrent users based on a record locking scheme. The nice thing about security limiting based on a record lock is that if user "A" turns their PC off without exiting your application, the record lock is released and the next time they login to the app, the don't have to go groveling to their Sys Admin to unlock their account.