Hello John
Are we talking logging in on the same computer?
If it is a computer that is shared among users, then you can make a logout after you have made changes as admin. Then a "new" user on the computer will be treated as a "guest" by the calendar.
If we are talking about differenet computers, then logged in as admin on one computer should not affect other computers.
The login is stored in cookies. If you have a Chrome browser and a Firefox browser on the same computer then you can be logged in in a session using the Chrome browser - and not logged in in a session using the Firefox browser.
Please give some more explanation about what you mean you can achieve by editing the config file.
The config is stored in the database and there is a lcconfig.php created on the server by installation (that you should not edit).