Which file did you transfer to the other computer? If it was only your application database then, you need to copy your security/workgroup database to the other machine as well. This is called system.mdw by default. You need to put it in the default location where Access looks for it. Or, you can specify the location using the /wrkgrp command line argument. It sounds like you should be placing this database on a network drive that all people have access to. The system.mdw file should also be placed there. Then when you make changes, all users will immediately have the change.