One of our departments has a very simple database consisting of several tables - no relationships. No forms. They do all their data entry directly in the individual tables (each table tracks correspondence for specific contract - there is a table for each contract). They swear that in the past, the tables were each individually locked so that multiple users can be in the database, but only one user at a time can enter records in the tables. And, now it doesn't work that way. How can I set the tables to be exclusive? There may be 50 people in the database at one time, but only one person is allowed in a table at a time. How can I do that?