Thanks Chris,
After our IT head suggested I look at the Server services first, I decided to put a timer on the top level form (with a check to make it run only once!).
Blair

Unless your app is already running 24/7, you'd probably be better served to do it outside the program. NT4 and Win2K both offer scheduling services to run programs at specified times. Our IT head set up several (one to kill leftover .TMP files, one to log out idle connections) and has had no problems with them. You'll have to set your update procedures to run straight up from a command prompt, but that's about it.

If you are running 24/7 already, then an application timer could fire off the procedure only when TIME() was greater than midnight, and make sure you only run it once...

Chris.