If you don't have a way to notify User a when updates are applied, you will need to devise a way yourself. 1 way would be to create another table with a single field and single row. Whenever user B/C/D updates a record in the table User A needs refreshed, update the new table with a value (1 for refresh). You can then use a timer to check the value of this table. If a refresh is required, you can pop up a message box asking User A if he wants to update right now or wait. That way, User A gets to decide if he is in the middle of something important and delay the refresh. If he says no, activate a refresh button on the screen. When a refresh happens, update the new table with a value (say 0 for just refreshed).