Microsoft Access Database Security - User Accounts:  When you create user accounts for an application, those accounts are stored in the workgroup that the users join when they use the application. Therefore, before you create the user accounts, you should make sure that you are in the correct workgroup information file.  You can add a user to a group account or remove a user from a group account by making selections in the Users tab of the Users And Group Accounts dialog box. Similarly, you can delete a user account or a group account from a workgroup by making selections in the Users tab or the Groups tab of the Users And Group Accounts dialog box. You cannot delete the group accounts Admins or Users.