Nope, I don't think so, because that would be too insecure. But, if you can't login to OS 9 at all, boot from a CD (or Mac OS X) and open the Preferences folder in the System Folder, then look for "Multiple users prefs" or "Login prefs" or something like that (I'm not sure what the file name is on english OS), and remove that file. Then you shoul be able to access OS 9 without having to login