Once you have worked offline, then each time that you log onto OfficeTalk, you will be automatically logged onto the offline database. It is possible to log onto the main database without marking your machine as working online. You can do this by selecting 'Main Database' from the Database drop down in the Login dialog box.
When you log in, you will be logged onto the main database. However your machine will not be marked as working online and subsequent logins will log you onto the offline database unless you select Main Database from the Database drop down.