Clear Last Login ID??

SL Login screen remembers the user name of the last successful login. Is there a way to turn off this feature? I cannot find it, and it is a privacy issue when others have access to the same computer. And you can't just blank it out .. There is a variable to "remember password" or not. Should be similar for "remember login id"??

I'm not sure, but I do know that if you delete that avatar's folder name in the c:\documents and settings\[owner name]\application data\secondlife\cache folder, the last login name doesn't appear in the login screen.