Username format

I think I know the answer to this question but I wanted to check with the Gurus! Does FreeRADIUS give a fig about what the username is? If it were all numeric, say 123456789 I guess it is happy with that? It's just a string to FreeRADIUS? If there was to be an issue, it would be the back end authentication system Unix/LDAP/AD etc and what it finds acceptable right? Thanks as always... -------------------------------------------------------- Barry Dean Principal Programmer/Analyst Networks Team Computing Service Department