[USR-TC] Login & PW!!!

Hello List: This question is for somebody who is using 3Com TC with freeRADIUS!!! In freeRADIUS file naspasswd (/usr/local/etc/raddb/naspasswd) has an entry for NAS as follows: <NAS ip-address> <login-Name> <password> Is the <NAS ip-address> of NAS is the IP address assigned to HiPerARC or something else? What is the <login-Name>? Where is it setup in 3Com TC? Where is the <password> setup in 3Com TC? I also notice that in "naspasswd" file the sample <login-Name> is "!root". I understand the "root" login-Name but why "!" ahead of it? What does it mean? Lots of questions & thanks. Kirti