ermm... I think he needs your computer name.
go to your desktop, right click your "My Computer" and choose properties. Go to the Network tab and check your computer name... I believe this is what he needs.
Also, go to your start menu and hit run. If you're on windows 2k or XP, type "cmd" and hit enter... otherwise, type "winipcfg" and hit enter. If you're on win2k or xp, type "ipconfig /all" at the dos prompt.
In either situation, you want to look for your adapter address (MAC address/MAC ID or Physical Address). This number is 6 groups of two digits to each group. Also generally contains alphanumeric combinations.
Give the IT admin this address along with your PC name. Hopefully that will help. Otherwise he may give you a lil more specifics so we can try again.